flag day

See also: Flag Day

English

Noun

flag day (plural flag days)

  1. (British, Ireland) A day on which a registered charity raises money, usually by selling small lapel flags.
  2. (Hong Kong) A day on which a registered charity raises money, usually by selling small stickers.
  3. (software) A day designated for changing to an incompatible system.
  4. (software) A change which is neither forward nor backward compatible.

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