SWAP

swap. Swap, v.t. to exchange, barter, swop

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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. 1. To strike; — with off. “Swap off his head!” Chaucer.
2. 2. To exchange (usually two things of the same kind); to swop. Miss Edgeworth.