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clock jack

noun, Horology.
jack1 (def 19).
Origin of clock jack
1925-30; earlier jack of the clock-(house), jackaclock; see jack1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Historical Examples
  • There was the clock jack, two splendid specimens of which are illustrated in Fig. 42, types becoming exceedingly rare.

    Chats on Household Curios Fred W. Burgess

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