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four-hundred-day clock

American  
[fawr-huhn-druhd-dey, fohr-] / ˈfɔrˌhʌn drədˈdeɪ, ˈfoʊr- /

noun

  1. a clock that needs to be wound once a year, having the works exposed under a glass dome and utilizing a torsion pendulum.

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.