mainspring noun - Definition, pictures, pronunciation and usage …
https://www.oxfordlearnersdictionaries.com/definition/english/mainspring
WEBthe most important spring in a watch, clock, etc. Definition of mainspring noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
DA: 18 PA: 6 MOZ Rank: 50