noun Download 🔗Share The principal spring of a clockwork mechanism, which drives it by uncoiling. Examples : "The old clock stopped working because the mainspring was broken. " machine part technical device time Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The most important reason for something (Cf. spring "origin of something" (literary) (often in the plural) the springs of her ambition). Examples : "My daughter is the mainspring of my life." business attitude mind philosophy Chat with AIVocabulary GamePractice Reading