MAINSPRING


Meaning of MAINSPRING in English

/ ˈmeɪnsprɪŋ; NAmE / noun

1.

[ usually sing. ] mainspring (of sth) ( formal ) the most important part of sth; the most important influence on sth

2.

the most important spring in a watch, clock, etc.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.