swop

ot noun

1. Space available in a swap file for use as auxiliary memory. How much swap do you need?
2. An exchange of two comparable things.
3. A financial derivative in which two parties agree to exchange one stream of cashflow against another stream.
4. A blow; a stroke.

fe’l 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.
4. To descend or fall; to rush hastily or violently.