balance wheel

noun Horology.
balance ( def 15 ).

1660–70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
balance wheel
a wheel oscillating against the hairspring of a timepiece, thereby regulating its beat

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
However, the balance wheel metaphor has another, perhaps unintended meaning.
Her chief function is to act as a sort of balance wheel for her husband.
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