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mainspring

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mainspring/ˈmeɪnˌsprɪŋ/noun
pluralmainsprings
mainspring
/ˈmeɪnˌsprɪŋ/
noun
pluralmainsprings
Learner's definition of MAINSPRING  
[count]
: the most important spring in a watch or clock
: the most important or powerful cause or part of something
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