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tone

verb [T]
 
 
/təʊn/ US  /toʊn/ (also tone up)

Definition

If you tone a part of the body, you make it firmer and stronger, usually by taking physical exercise: This is a good exercise for toning up the thighs.Exercising and training
(Definition of tone verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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