Source : Webster's Revised Unabridged Dictionary (1913)

Pun \Pun\, v. t. [See {Pound} to beat.]
   To pound. [Obs.]

         He would pun thee into shivers with his fist. --Shak.

Pun \Pun\, n. [Cf. {Pun} to pound, {Pound} to beat.]
   A play on words which have the same sound but different
   meanings; an expression in which two different applications
   of a word present an odd or ludicrous idea; a kind of quibble
   or equivocation. --Addison.

         A better put on this word was made on the Beggar's
         Opera, which, it was said, made Gay rich, and Rich gay.
                                                  --Walpole.

Pun \Pun\, v. i. [imp. & p. p. {Punned}; p. pr. & vb. n.
   {Punning}.]
   To make puns, or a pun; to use a word in a double sense,
   especially when the contrast of ideas is ludicrous; to play
   upon words; to quibble. --Dryden.

Pun \Pun\, v. t.
   To persuade or affect by a pun. --Addison.

Source : WordNet®

pun
     n : a humorous play on words; "I do it for the pun of it"; "his
         constant punning irritated her" [syn: {punning}, {wordplay},
          {paronomasia}]
     [also: {punning}, {punned}]

pun
     v : make a play on words; "Japanese like to pun--their language
         is well suited to punning"
     [also: {punning}, {punned}]