Source : Webster's Revised Unabridged Dictionary (1913)

Flush \Flush\, v. t.
   To cause by flow; to draw water from, or pour it over or
   through (a pond, meadow, sewer, etc.); to cleanse by means of
   a rush of water.

Flush \Flush\, v. i. (Mining)
   (a) To operate a placer mine, where the continuous supply of
       water is insufficient, by holding back the water, and
       releasing it periodically in a flood.
   (b) To fill underground spaces, especially in coal mines,
       with material carried by water, which, after drainage,
       constitutes a compact mass.

Flush \Flush\, v. i. [imp. & p. p. {Flushed}; p. pr. & vb. n.
   {Flushing}.] [Cf. OE. fluschen to fly up, penetrate, F. fluz
   a flowing, E. flux, dial. Sw. flossa to blaze, and E. flash;
   perh. influenced by blush. [root]84.]
   1. To flow and spread suddenly; to rush; as, blood flushes
      into the face.

            The flushing noise of many waters.    --Boyle.

            It flushes violently out of the cock. --Mortimer.

   2. To become suddenly suffused, as the cheeks; to turn red;
      to blush.

   3. To snow red; to shine suddenly; to glow.

            In her cheek, distemper flushing glowed. --Milton.

   4. To start up suddenly; to take wing as a bird.

            Flushing from one spray unto another. --W. Browne.

Flush \Flush\, v. t.
   1. To cause to be full; to flood; to overflow; to overwhelm
      with water; as, to flush the meadows; to flood for the
      purpose of cleaning; as, to flush a sewer.

   2. To cause the blood to rush into (the face); to put to the
      blush, or to cause to glow with excitement.

            Nor flush with shame the passing virgin's cheek.
                                                  --Gay.

            Sudden a thought came like a full-blown rose,
            Flushing his brow.                    --Keats.

   3. To make suddenly or temporarily red or rosy, as if
      suffused with blood.

            How faintly flushed. how phantom fair, Was Monte
            Rosa, hanging there!                  --Tennyson.

   4. To excite; to animate; to stir.

            Such things as can only feed his pride and flush his
            ambition.                             --South.

   5. To cause to start, as a hunter a bird. --Nares.

   {To flush a joints} (Masonry), to fill them in; to point the
      level; to make them flush.

Flush \Flush\, a.
   1. Full of vigor; fresh; glowing; bright.

            With all his crimes broad blown, as flush as May.
                                                  --Shak.

   2. Affluent; abounding; well furnished or suppled; hence,
      liberal; prodigal.

            Lord Strut was not very flush in ready. --Arbuthnot.

   3. (Arch. & Mech.) Unbroken or even in surface; on a level
      with the adjacent surface; forming a continuous surface;
      as, a flush panel; a flush joint.

   4. (Card Playing) Consisting of cards of one suit.

   {Flush bolt}.
      (a) A screw bolt whose head is countersunk, so as to be
          flush with a surface.
      (b) A sliding bolt let into the face or edge of a door, so
          as to be flush therewith.

   {Flush deck}. (Naut.) See under {Deck}, n., 1.

   {Flush tank}, a water tank which can be emptied rapidly for
      flushing drainpipes, etc.

Flush \Flush\, adv.
   So as to be level or even.

Flush \Flush\, n.
   1. A sudden flowing; a rush which fills or overflows, as of
      water for cleansing purposes.

            In manner of a wave or flush.         --Ray.

   2. A suffusion of the face with blood, as from fear, shame,
      modesty, or intensity of feeling of any kind; a blush; a
      glow.

            The flush of angered shame.           --Tennyson.

   3. Any tinge of red color like that produced on the cheeks by
      a sudden rush of blood; as, the flush on the side of a
      peach; the flush on the clouds at sunset.

   4. A sudden flood or rush of feeling; a thrill of excitement.
      animation, etc.; as, a flush of joy.

   5. A flock of birds suddenly started up or flushed.

   6. [From F. or Sp. flux. Cf. {Flux}.] A hand of cards of the
      same suit.

Source : WordNet®

flush
     adj 1: of a surface exactly even with an adjoining one, forming the
            same plane; "a door flush with the wall"; "the bottom
            of the window is flush with the floor" [syn: {flush(p)}]
     2: having an abundant supply of money or possessions of value;
        "an affluent banker"; "a speculator flush with cash"; "not
        merely rich but loaded"; "moneyed aristocrats"; "wealthy
        corporations" [syn: {affluent}, {loaded}, {moneyed}, {wealthy}]

flush
     n 1: the period of greatest prosperity or productivity [syn: {flower},
           {prime}, {peak}, {heyday}, {bloom}, {blossom}, {efflorescence}]
     2: a rosy color (especially in the cheeks) taken as a sign of
        good health [syn: {bloom}, {blush}, {rosiness}]
     3: sudden brief sensation of heat (associated with menopause
        and some mental disorders) [syn: {hot flash}]
     4: a poker hand with all 5 cards in the same suit
     5: the swift release of a store of affective force; "they got a
        great bang out of it"; "what a boot!"; "he got a quick
        rush from injecting heroin"; "he does it for kicks" [syn:
        {bang}, {boot}, {charge}, {rush}, {thrill}, {kick}]
     6: a sudden rapid flow (as of water); "he heard the flush of a
        toilet"; "there was a little gush of blood"; "she attacked
        him with an outpouring of words" [syn: {gush}, {outpouring}]
     7: sudden reddening of the face (as from embarrassment or guilt
        or shame or modesty) [syn: {blush}]
     adv 1: squarely or solidly; "hit him flush in the face"
     2: in the same plane; "set it flush with the top of the table"

flush
     v 1: turn red, as if in embarrassment or shame; "The girl blushed
          when a young man whistled as she walked by" [syn: {blush},
           {crimson}, {redden}]
     2: flow freely; "The garbage flushed down the river"
     3: make level or straight; "level the ground" [syn: {level}, {even
        out}, {even}]
     4: polish and make shiny; "buff the wooden floors"; "buff my
        shoes" [syn: {buff}, {burnish}, {furbish}]
     5: rinse, clean, or empty with a liquid; "flush the wound with
        antibiotics"; "purge the old gas tank" [syn: {scour}, {purge}]
     6: irrigate with water from a sluice; "sluice the earth" [syn:
        {sluice}]
     7: cause to flow or flood with or as if with water; "flush the
        meadows"

Source : Free On-Line Dictionary of Computing

flush
     
        1. To delete something, usually superfluous, or to abort an
        operation.
     
        "Flush" was standard {ITS} terminology for aborting an output
        operation.  One spoke of the text that would have been
        printed, but was not, as having been flushed.  It is
        speculated that this term arose from a vivid image of flushing
        unwanted characters by hosing down the internal output buffer,
        washing the characters away before they could be printed.
     
        2. To force temporarily buffered data to be written to more
        permanent memory.  E.g. flushing buffered disk I/O to disk, as
        with {C}'s {standard I/O} library "fflush(3)" call.  This
        sense was in use among {BLISS} programmers at {DEC} and on
        {Honeywell} and {IBM} machines as far back as 1965.  Another
        example of this usage is flushing a {cache} on a {context
        switch} where modified data stored in the cace which belongs
        to one processes must be written out to main memory so that
        the cache can be used by another process.
     
        [{Jargon File}]