British and Australian slang for a civilian (someone not in the military); often used by soldiers to refer to non-military people.
Shortened colloquial form of 'civilian,' used particularly by military personnel. The '-y' diminutive suffix makes it an informal, casual term.
Military slang often shortens words with informal suffixes—'civvy' emerged in the 20th century as soldiers needed a quick way to distinguish themselves from 'civvies' (civilians). The plural 'civvies' even became military slang for civilian clothes.
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