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.
[1913 Webster]
2. To exchange (usually two things of the same kind); to
swop. [Colloq.] --Miss Edgeworth.
[1913 Webster]