verb

• (transitive) To exchange or give (something) in an non-normal exchange (for something else).
  "In an effort to provide more permanent accommodations, employers may offer employees the opportunity either to swap jobs with a colleague or to transfer to a new position."
• (transitive, obsolete) To hit, to strike.
  "And he whipped his sword out of its scabbard, and swapped off the pudding from the black knight's nose. Unfortunately (for him) he swapped off a good bit of the nose, too."
• (transitive, obsolete) To beat the air, or ply the wings, with a sweeping motion or noise; to flap.
• (intransitive, obsolete) To descend or fall; to rush hastily or violently.

noun

• (finance) A financial derivative in which two parties agree to exchange one stream of non-normal cashflow against another stream.
• (computing, informal, uncountable) Space available in a swap file for use as auxiliary memory.
  "How much swap do you need?"
• (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.