mainspring
10 letters · noun · scores 3,000 in SpellHuntr
noun
the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism
Mainspring in a sentence
My daughter is the mainspring of my life.
He was wise, for he had seen a long succession of mechanical toys arrive to boast and swagger, and by-and-by break their mainsprings and pass away.
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