Source : Webster's Revised Unabridged Dictionary (1913)

Clap \Clap\, v. i.
   1. To knock, as at a door. [Obs.] --Chaucer.

   2. To strike the hands together in applause.

            Their ladies bid them clap.           --Shak.

   3. To come together suddenly with noise.

            The doors around me clapped.          --Dryden.

   4. To enter with alacrity and briskness; -- with to or into.
      [Obs.] ``Shall we clap into it roundly, without . . .
      saying we are hoarse?'' --Shak.

   5. To talk noisily; to chatter loudly. [Obs.] --Chaucer.

Clap \Clap\, v. t. [imp. & p. p. {Clapped}; p. pr. & vb. n.
   {Clapping}.] [AS. clappan; akin to Icel. & Sw. klappa, D,
   klappen, to clap, prate, G. klaffen, v. i., to split open,
   yelp, klopfen, v. t. & i., to knock.]
   1. To strike; to slap; to strike, or strike together, with a
      quick motion, so, as to make a sharp noise; as, to clap
      one's hands; a clapping of wings.

            Then like a bird it sits and sings, And whets and
            claps its silver wings.               --Marvell.

   2. To thrust, drive, put, or close, in a hasty or abrupt
      manner; -- often followed by to, into, on, or upon.

            He had just time to get in and clap to the door.
                                                  --Locke

            Clap an extinguaisher upon your irony. --Lamb.

   3. To manifest approbation of, by striking the hands
      together; to applaud; as, to clap a performance.

   {To clap hands}.
      (a) To pledge faith by joining hands. [Obs.] --Shak.
      (b) To express contempt or derision. [Obs.] --Lam. ii. 15.

   {To clap hold of}, to seize roughly or quickly.

   {To clap up}.
      (a) To imprison hastily or without due formality.
      (b) To make or contrive hastily. [Obs.] ``Was ever match
          clapped up so suddenly?'' --Shak.

Clap \Clap\ (kl[a^]p), n.
   1. A loud noise made by sudden collision; a bang. ``Give the
      door such a clap, as you go out, as will shake the whole
      room.'' --Swift.

   2. A burst of sound; a sudden explosion.

            Horrible claps of thunder.            --Hakewill.

   3. A single, sudden act or motion; a stroke; a blow.

            What, fifty of my followers at a clap! --Shak.

   4. A striking of hands to express approbation.

            Unextrected claps or hisses.          --Addison.

   5. Noisy talk; chatter. [Obs.] --Chaucer.

   6. (Falconry) The nether part of the beak of a hawk.

   {Clap dish}. See {Clack dish}, under {Clack}, n.

   {Clap net}, a net for taking birds, made to close or clap
      together.

Clap \Clap\, n. [Cf. OF. clapoir.]
   Gonorrhea.

Source : WordNet®

clap
     v 1: put quickly or forcibly; "The judge clapped him in jail"
     2: cause to strike the air in flight; "The big bird clapped its
        wings"
     3: clap one's hands or shout after performances to indicate
        approval [syn: {applaud}, {spat}, {acclaim}] [ant: {boo}]
     4: clap one's hands together; "The children were clapping to
        the music" [syn: {spat}]
     5: strike the air in flight; "the wings of the birds clapped
        loudly"
     6: strike with the flat of the hand; usually in a friendly way,
        as in encouragement or greeting
     7: strike together so as to produce a sharp percussive noise;
        "clap two boards together"
     [also: {clapping}, {clapped}]

clap
     n 1: a sudden very loud noise [syn: {bang}, {eruption}, {blast},
          {loud noise}]
     2: a common venereal disease caused by the bacterium Neisseria
        gonorrhoeae; symptoms are painful urination and pain
        around the urethra [syn: {gonorrhea}, {gonorrhoea}]
     3: a sharp abrupt noise as if two objects hit together; may be
        repeated [syn: {clack}]
     [also: {clapping}, {clapped}]