Source : Webster's Revised Unabridged Dictionary (1913)

Drop \Drop\, v. i.
   1. To fall in drops.

            The kindly dew drops from the higher tree, And wets
            the little plants that lowly dwell.   --Spenser.

   2. To fall, in general, literally or figuratively; as, ripe
      fruit drops from a tree; wise words drop from the lips.

            Mutilations of which the meaning has dropped out of
            memory.                               --H. Spencer.

            When the sound of dropping nuts is heard. --Bryant.

   3. To let drops fall; to discharge itself in drops.

            The heavens . . . dropped at the presence of God.
                                                  --Ps. lxviii.
                                                  8.

   4. To fall dead, or to fall in death.

            Nothing, says Seneca, so soon reconciles us to the
            thoughts of our own death, as the prospect of one
            friend after another dropping round us. --Digby.

   5. To come to an end; to cease; to pass out of mind; as, the
      affair dropped. --Pope.

   6. To come unexpectedly; -- with in or into; as, my old
      friend dropped in a moment. --Steele.

            Takes care to drop in when he thinks you are just
            seated.                               --Spectator.

   7. To fall or be depressed; to lower; as, the point of the
      spear dropped a little.

   8. To fall short of a mark. [R.]

            Often it drops or overshoots by the disproportion of
            distance.                             --Collier.

   9. To be deep in extent; to descend perpendicularly; as, her
      main topsail drops seventeen yards.

   {To drop astern} (Naut.), to go astern of another vessel; to
      be left behind; to slacken the speed of a vessel so as to
      fall behind and to let another pass a head.

   {To drop down} (Naut.), to sail, row, or move down a river,
      or toward the sea.

   {To drop off}, to fall asleep gently; also, to die. [Colloq.]

Astern \A*stern"\, adv. [Pref. a- + stern.] (Naut.)
   1. In or at the hinder part of a ship; toward the hinder
      part, or stern; backward; as, to go astern.

   2. Behind a ship; in the rear. ``A gale of wind right
      astern.'' --De Foe. ``Left this strait astern.'' --Drake.

   {To bake astern}, to go stern foremost.

   {To be astern of the reckoning}, to be behind the position
      given by the reckoning.

   {To drop astern}, to fall or be left behind.

   {To go astern}, to go backward, as from the action of
      currents or winds.