Source : Webster's Revised Unabridged Dictionary (1913)

Swap \Swap\, v. t. [imp. & p. p. {Swapped}; p. pr. & vb. n.
   {Swapping}.] [OE. swappen to strike; cf. E. to strike a
   bargain; perh. akin to E. sweep. Cf. {Swap} a blow, {Swap},
   v. i.] [Written also {swop}.]
   1. To strike; -- with off. [Obs. or Prov. Eng.] ``Swap off
      his head!'' --Chaucer.

   2. To exchange (usually two things of the same kind); to
      swop. [Colloq.] --Miss Edgeworth.

Source : WordNet®

swap
     n : an equal exchange; "we had no money so we had to live by
         barter" [syn: {barter}, {swop}, {trade}]
     [also: {swops}, {swopping}, {swopped}, {swapping}, {swapped}]

swap
     v 1: exchange or give (something) in exchange for [syn: {trade},
          {swop}, {switch}]
     2: move (a piece of a program) into memory, in computer science
     [also: {swops}, {swopping}, {swopped}, {swapping}, {swapped}]

swapping
     See {swap}

Source : Free On-Line Dictionary of Computing

swapping
     
        {swap}