The Collaborative International Dictionary of English v.0.48:

Drop \Drop\, v. i.
   1. To fall in drops.
      [1913 Webster]

            The kindly dew drops from the higher tree,
            And wets the little plants that lowly dwell.
                                                  --Spenser.
      [1913 Webster]

   2. To fall, in general, literally or figuratively; as, ripe
      fruit drops from a tree; wise words drop from the lips.
      [1913 Webster]

            Mutilations of which the meaning has dropped out of
            memory.                               --H. Spencer.
      [1913 Webster]

            When the sound of dropping nuts is heard. --Bryant.
      [1913 Webster]

   3. To let drops fall; to discharge itself in drops.
      [1913 Webster]

            The heavens . . . dropped at the presence of God.
                                                  --Ps. lxviii.
                                                  8.
      [1913 Webster]

   4. To fall dead, or to fall in death; as, dropping like
      flies.
      [1913 Webster]

            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.
      [1913 Webster]

   5. To come to an end; to cease; to pass out of mind; as, the
      affair dropped. --Pope.
      [1913 Webster]

   6. To come unexpectedly; -- with in or into; as, my old
      friend dropped in a moment. --Steele.
      [1913 Webster]

            Takes care to drop in when he thinks you are just
            seated.                               --Spectator.
      [1913 Webster]

   7. To fall or be depressed; to lower; as, the point of the
      spear dropped a little.
      [1913 Webster]

   8. To fall short of a mark. [R.]
      [1913 Webster]

            Often it drops or overshoots by the disproportion of
            distance.                             --Collier.
      [1913 Webster]

   9. To be deep in extent; to descend perpendicularly; as, her
      main topsail drops seventeen yards.
      [1913 Webster]

   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.]
      [1913 Webster]