locking piece

locking piece WORD ORIGIN noun Horology. (in a striking train) a hooked part, rising and falling on a locking plate and arresting the rotation of the plate after the proper number of strokes. Liberaldictionary.com

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Origin of locking piece First recorded in 1810–20 Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019