ninety-day wonder

[ nahyn-tee-dey ]
/ ˈnaɪn tiˌdeɪ /

noun Informal.

an officer commissioned in a branch of the armed forces after an unusually short training period, especially after a three-months officers' training course during World War II.

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Origin of ninety-day wonder

An Americanism dating back to 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020