balance wheel

noun Horology.
balance ( def 15 ).

Origin:
1660–70

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World English Dictionary
balance wheel
 
n
a wheel oscillating against the hairspring of a timepiece, thereby regulating its beat

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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