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Origin of clock jack
1925–30; earlier jack of the clock-(house), jackaclock; see jack1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for clock jack
So he took the matter in hand and invented a clock-jack that was much better than the imported one.Christopher and the Clockmakers|Sara Ware Bassett