(software) A day designated for changing to an incompatible system.
(software) A day designated for changing to an incompatible system.
Add your own interpretation of "flag day".
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(informal, slang, American, uncommon) Used to indicate a problem or issue.
A cue, warning, or alert; a sign or signal that something is wrong.
A warning sign in dating or friendships — a behavior that suggests incompatibility or trouble. Compare with "green flag" (good sign) and "beige flag" (odd but neutral). "He doesn't tip waiters" has ended more relationships than any app algorithm.
(British, Ireland) A day on which a registered charity raises money, usually by selling small lapel flags.
(Hong Kong) A day on which a registered charity raises money, usually by selling small stickers.