firm (sth) up phrasal verb, verb Meaning in Cambridge English Dictionary
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Meaning of "firm (sth) up" - English Dictionary

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firm (sth) up

phrasal verb with firm uk   /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.
(Definition of firm (sth) up phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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