noun

• (informal) A female singer, soprano, a coloratura singer.
• (slang) An informer or snitch; a squealer.
• (slang) A (usually yellow) capsule of the short-acting barbiturate pentobarbital/pentobarbitone (Nembutal).
• (Australia, informal) A yellow sticker applied by the police to a vehicle to indicate it is unroadworthy.
  "The tendency in these types of situations (as far as I can see) is that because I don't think the act itself is illegal, the police will go through your vehicle systematically loking^([sic]) for anything wrong with it, to slap a canary on it (that's slang for an unroadworthy sticker) or present you with some other fine."

verb

• (intransitive) To dance nimbly (as in the canary dance).
  "but to jig off a tune at / the tongue's end, canary to it with your feet,"
• (slang) To inform or snitch, to betray secrets, especially about illegal activities.
• (software engineering) To test a software change by rolling out to a small set of machines or users before making it available to all.

noun

• (soccer) Someone connected with Norwich City Football Club, as a fan, player, coach etc.

adj

• (finance, of an option) That can be exercised on quarterly dates, a set time period (usually one year) after the issue date, and before the expiry date.
  "Canary callable bonds are a type of step-up bond that is a hybrid structure, having elements of both Bermudan and European calls."