self winding
/ˌsɛlfˈwaɪndɪŋ/
adjective
- (of a watch or clock) Powered by the natural motion of the wearer's arm, so it does not need to be wound manually.
- Self-winding watches use a rotor that spins with movement to keep the mainspring tight.
- He bought a self-winding watch that never needed a key to wind it.
- My grandfather gave me his old self-winding wristwatch, and it still runs perfectly.
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