a toy gun using caps to imitate the sound of a real pistol.
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Origin of cap pistol
An Americanism dating back to 1915–20
Also called cap gun.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for cap pistol
He was simply yet appropriately equipped with a cap-pistol, and two bananas for provender while crossing the wilderness.The Believing Years|Edmund Lester Pearson