Mainspring Definition

mānsprĭng
mainsprings
noun
The principal spring in a clock, watch, or other mechanism; driving spring, whose steady uncoiling keeps the mechanism running.
Webster's New World
The chief motive or cause.
Webster's New World
(figuratively) The most important reason for something.
My daughter is the mainspring of my life.
Wiktionary
Synonyms:

Other Word Forms of Mainspring

Noun

Singular:
mainspring
Plural:
mainsprings

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Unscrambles

mainspring