buff up

phrasal verb
buffed up; buffing up; buffs up

Definition of buff up

: to become stronger and more muscular or to make (someone or something) stronger and more muscular through exercising and weight lifting She is buffing up for her role as a female boxer. He buffed himself up by going to the gym every day. often used as buffed-up buffed-up bodies

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“Buff up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/buff%20up. Accessed 3 Mar. 2021.

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