1. mainspring

noun. the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism.


  • clockwork


  • autumnal equinox
  • inelasticity

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Example sentences of the word mainspring

1. Noun, singular or mass
Ideally, if you stop just short of the mainspring’s full potential, your clock will run just fine for a full week without having to get any attention from you.

2. Verb, gerund or present participle
The self-winding feature may wind the watch's mainspring a bit when you pick the watch up.