mainspring -
the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism
spring a metal elastic device that returns to its shape or position when pushed or pulled or pressed; "the spring was broken"
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Wiktionary
Substantiv
mainspring -
The principal spring of a clockwork mechanism, that drives it by uncoiling.
mainspring -
The most important reason for something.
Wikipedia
A mainspring is a spiral torsion spring of metal ribbon that is the power source in mechanical watches and some clocks. Winding the timepiece, by turning a knob or key, stores energy in the mainspring by twisting the spiral tighter. The force of the mainspring then turns the clock's wheels as it unwinds, until the next winding is needed.
