Definitions from Wiktionary ( )

▸ verb:  (transitive) To exchange or give (something) in an exchange (for something else).
▸ verb:  (transitive, obsolete) To hit, to strike.
▸ verb:  (transitive, obsolete) To beat the air, or ply the wings, with a sweeping motion or noise; to flap.
▸ verb:  (intransitive, obsolete) To descend or fall; to rush hastily or violently.
▸ noun:  An exchange of two comparable things.
▸ noun:  (finance) A financial derivative in which two parties agree to exchange one stream of cashflow against another stream.
▸ noun:  (computing, informal, uncountable) Space available in a swap file for use as auxiliary memory.
▸ noun:  (Cambridge University slang) 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.
▸ noun:  (obsolete, UK, dialect) A blow; a stroke.

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