Source : Webster's Revised Unabridged Dictionary (1913)

Up \Up\, adv. [AS. up, upp, ?p; akin to OFries. up, op, D. op,
   OS. ?p, OHG. ?f, G. auf, Icel. ? Sw. upp, Dan. op, Goth. iup,
   and probably to E. over. See {Over}.]
   1. Aloft; on high; in a direction contrary to that of
      gravity; toward or in a higher place or position; above;
      -- the opposite of {down}.

            But up or down, By center or eccentric, hard to
            tell.                                 --Milton.

   2. Hence, in many derived uses, specifically:
      (a) From a lower to a higher position, literally or
          figuratively; as, from a recumbent or sitting
          position; from the mouth, toward the source, of a
          river; from a dependent or inferior condition; from
          concealment; from younger age; from a quiet state, or
          the like; -- used with verbs of motion expressed or
          implied.

                But they presumed to go up unto the hilltop.
                                                  --Num. xiv.
                                                  44.

                I am afflicted and ready to die from my youth
                up.                               --Ps.
                                                  lxxxviii. 15.

                Up rose the sun, and up rose Emelye. --Chaucer.

                We have wrought ourselves up into this degree of
                Christian indifference.           --Atterbury.
      (b) In a higher place or position, literally or
          figuratively; in the state of having arisen; in an
          upright, or nearly upright, position; standing;
          mounted on a horse; in a condition of elevation,
          prominence, advance, proficiency, excitement,
          insurrection, or the like; -- used with verbs of rest,
          situation, condition, and the like; as, to be up on a
          hill; the lid of the box was up; prices are up.

                And when the sun was up, they were scorched.
                                                  --Matt. xiii.
                                                  6.

                Those that were up themselves kept others low.
                                                  --Spenser.

                Helen was up -- was she?          --Shak.

                Rebels there are up, And put the Englishmen unto
                the sword.                        --Shak.

                His name was up through all the adjoining
                provinces, even to Italy and Rome; many desiring
                to see who he was that could withstand so many
                years the Roman puissance.        --Milton.

                Thou hast fired me; my soul's up in arms.
                                                  --Dryden.

                Grief and passion are like floods raised in
                little brooks by a sudden rain; they are quickly
                up.                               --Dryden.

                A general whisper ran among the country people,
                that Sir Roger was up.            --Addison.

                Let us, then, be up and doing, With a heart for
                any fate.                         --Longfellow.
      (c) To or in a position of equal advance or equality; not
          short of, back of, less advanced than, away from, or
          the like; -- usually followed by to or with; as, to be
          up to the chin in water; to come up with one's
          companions; to come up with the enemy; to live up to
          engagements.

                As a boar was whetting his teeth, up comes a fox
                to him.                           --L'Estrange.
      (d) To or in a state of completion; completely; wholly;
          quite; as, in the phrases to eat up; to drink up; to
          burn up; to sum up; etc.; to shut up the eyes or the
          mouth; to sew up a rent.

   Note: Some phrases of this kind are now obsolete; as, to
         spend up (--Prov. xxi. 20); to kill up (--B. Jonson).
      (e) Aside, so as not to be in use; as, to lay up riches;
          put up your weapons.

   Note: Up is used elliptically for get up, rouse up, etc.,
         expressing a command or exhortation. ``Up, and let us
         be going.'' --Judg. xix. 28.

               Up, up, my friend! and quit your books, Or surely
               you 'll grow double.               --Wordsworth.

   {It is all up with him}, it is all over with him; he is lost.
      

   {The time is up}, the allotted time is past.

   {To be up in}, to be informed about; to be versed in.
      ``Anxious that their sons should be well up in the
      superstitions of two thousand years ago.'' --H. Spencer.

   {To be up to}.
      (a) To be equal to, or prepared for; as, he is up to the
          business, or the emergency. [Colloq.]
      (b) To be engaged in; to purpose, with the idea of doing
          ill or mischief; as, I don't know what he's up to.
          [Colloq.]

   {To blow up}.
      (a) To inflate; to distend.
      (b) To destroy by an explosion from beneath.
      (c) To explode; as, the boiler blew up.
      (d) To reprove angrily; to scold. [Slang]

   {To bring up}. See under {Bring}, v. t.

   {To come up with}. See under {Come}, v. i.

   {To cut up}. See under {Cut}, v. t. & i.

   {To draw up}. See under {Draw}, v. t.

   {To grow up}, to grow to maturity.

   {Up anchor} (Naut.), the order to man the windlass
      preparatory to hauling up the anchor.

   {Up and down}.
      (a) First up, and then down; from one state or position to
          another. See under {Down}, adv.

                Fortune . . . led him up and down. --Chaucer.
      (b) (Naut.) Vertical; perpendicular; -- said of the cable
          when the anchor is under, or nearly under, the hawse
          hole, and the cable is taut. --Totten.

   {Up helm} (Naut.), the order given to move the tiller toward
      the upper, or windward, side of a vessel.

   {Up to snuff}. See under {Snuff}. [Slang]

   {What is up?} What is going on? [Slang]

Down \Down\, adv. [For older adown, AS. ad?n, ad?ne, prop., from
   or off the hill. See 3d {Down}, and cf. {Adown}, and cf.
   {Adown}.]
   1. In the direction of gravity or toward the center of the
      earth; toward or in a lower place or position; below; --
      the opposite of up.

   2. Hence, in many derived uses, as:
      (a) From a higher to a lower position, literally or
          figuratively; in a descending direction; from the top
          of an ascent; from an upright position; to the ground
          or floor; to or into a lower or an inferior condition;
          as, into a state of humility, disgrace, misery, and
          the like; into a state of rest; -- used with verbs
          indicating motion.

                It will be rain to-night. Let it come down.
                                                  --Shak.

                I sit me down beside the hazel grove.
                                                  --Tennyson.

                And that drags down his life.     --Tennyson.

                There is not a more melancholy object in the
                learned world than a man who has written himself
                down.                             --Addison.

                The French . . . shone down [i. e., outshone]
                the English.                      --Shak.
      (b) In a low or the lowest position, literally or
          figuratively; at the bottom of a decent; below the
          horizon; of the ground; in a condition of humility,
          dejection, misery, and the like; in a state of quiet.

                I was down and out of breath.     --Shak.

                The moon is down; I have not heard the clock.
                                                  --Shak.

                He that is down needs fear no fall. --Bunyan.

   3. From a remoter or higher antiquity.

            Venerable men! you have come down to us from a
            former generation.                    --D. Webster.

   4. From a greater to a less bulk, or from a thinner to a
      thicker consistence; as, to boil down in cookery, or in
      making decoctions. --Arbuthnot.

   Note: Down is sometimes used elliptically, standing for go
         down, come down, tear down, take down, put down, haul
         down, pay down, and the like, especially in command or
         exclamation.

               Down, therefore, and beg mercy of the duke.
                                                  --Shak.

               If he be hungry more than wanton, bread alone
               will down.                         --Locke.
         Down is also used intensively; as, to be loaded down;
         to fall down; to hang down; to drop down; to pay down.

               The temple of Her[`e] at Argos was burnt down.
                                                  --Jowett
                                                  (Thucyd. ).
         Down, as well as up, is sometimes used in a
         conventional sense; as, down East.

               Persons in London say down to Scotland, etc., and
               those in the provinces, up to London.
                                                  --Stormonth.

   {Down helm} (Naut.), an order to the helmsman to put the helm
      to leeward.

   {Down on} or {upon} (joined with a verb indicating motion, as
      go, come, pounce), to attack, implying the idea of
      threatening power.

            Come down upon us with a mighty power. --Shak.

   {Down with}, take down, throw down, put down; -- used in
      energetic command. ``Down with the palace; fire it.''
      --Dryden.

   {To be down on}, to dislike and treat harshly. [Slang, U.S.]
      

   {To cry down}. See under {Cry}, v. t.

   {To cut down}. See under {Cut}, v. t.

   {Up and down}, with rising and falling motion; to and fro;
      hither and thither; everywhere. ``Let them wander up and
      down.'' --Ps. lix. 15.

Source : WordNet®

up and down
     adv 1: moving backward and forward along a given course; "he walked
            up and down the locker room"; "all up and down the
            Eastern seaboard"
     2: alternately upward and downward; "he eyed him up and down"