Source : Webster's Revised Unabridged Dictionary (1913)

Clown \Clown\ (kloun), n. [Cf. Icel. klunni a clumsy, boorish
   fellow, North Fries. kl["o]nne clown, dial. Sw. klunn log,
   Dan. klunt log, block, and E. clump, n.]
   1. A man of coarse nature and manners; an awkward fellow; an
      ill-bred person; a boor. --Sir P. Sidney.

   2. One who works upon the soil; a rustic; a churl.

            The clown, the child of nature, without guile.
                                                  --Cowper.

   3. The fool or buffoon in a play, circus, etc.

            The clown shall make those laugh whose lungs are
            tickle o'the sere.                    --Shak.

Clown \Clown\, v. i.
   To act as a clown; -- with it. [Obs.]

         Beshrew me, he clowns it properly indeed. --B. Jonson.

Source : WordNet®

clown
     n 1: a rude or vulgar fool [syn: {buffoon}]
     2: a person who amuses others by ridiculous behavior [syn: {buffoon},
         {merry andrew}]
     v : act as or like a clown [syn: {clown around}, {antic}]