SWOP

verb

1. To exchange or give (something) in an exchange (for something else).
2. To hit, to strike.
3. To beat the air, or ply the wings, with a sweeping motion or noise; to flap.

noun

1. An exchange of two comparable things.
2. A financial derivative in which two parties agree to exchange one stream of cashflow against another stream.
3. Space available in a swap file for use as auxiliary memory.

noun

1. A blow; a stroke.