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tone

noun [U] (TIGHTNESS)
 
 
/təʊn/ US  /toʊn/

Definition

the healthy tightness of the body, especially the muscles: After you've had a baby you lose the muscle tone in your stomach.Fit and healthy
(Definition of tone noun (TIGHTNESS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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