Mainspring meaning

mānsprĭng
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The principal spring in a mechanical device, especially a watch or clock, that drives the mechanism by uncoiling.
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The chief motivating force.

The mainspring of a reform movement.

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The principal spring in a clock, watch, or other mechanism; driving spring, whose steady uncoiling keeps the mechanism running.
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The chief motive or cause.
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The principal spring of a clockwork mechanism, that drives it by uncoiling.
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(figuratively) The most important reason for something.

My daughter is the mainspring of my life.

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