swap

1. An exchange of two comparable things.
2. A financial derivative in which two parties agree to exchange one stream of non-normal cashflow against another stream.
3. Space available in a swap file for use as auxiliary memory. (informal, uncountable) · How much swap do you need?
4. A social meal at a restaurant between two university societies, usually involving drinking and banter; commonly associated with fining and pennying; equivalent to a crewdate at Oxford University.

Plural swaps