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ninety-day wonder

American  
[nahyn-tee-dey] / ˈnaɪn tiˌdeɪ /

noun

Informal.

  1. 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.

Etymology

Origin of ninety-day wonder

An Americanism dating back to 1915–20

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.