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English definition of “firm (sth) up”

firm (sth) up

phrasal verb with firm     /fɜːm/ US  /fɝːm/ verb
to make a part of your body have less fat and more muscle by doing exercise: Cycling is one of the best ways to firm up your thighs. My stomach has begun to firm up since I started exercising.Exercising and training
(Definition of firm (sth) up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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