noun🔗ShareThe principal spring of a clockwork mechanism, which drives it by uncoiling."The old clock stopped working because the mainspring was broken. "machineparttechnicaldevicetimeChat with AIVocabulary GamePractice Reading
noun🔗ShareThe most important reason for something (Cf. spring "origin of something" (literary) (often in the plural) the springs of her ambition)."My daughter is the mainspring of my life."businessattitudemindphilosophyChat with AIVocabulary GamePractice Reading
