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rating nut

American  

noun

Horology.

  1. a nut that screws onto the lower end of the rod of a clock pendulum for raising or lowering the weight to alter the rate of the clock.

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.