1 firm up Rate this phrase:(0.00 / 0 votes)
To make muscles more toned through physical exercise.

He hopes to firm up his biceps a bit before meeting the girls.

2 firm up Rate this phrase:(0.00 / 0 votes)
To make tentative plans more definite.

Can we firm up plans for the barbecue Sunday?.

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"firm up." Phrases.net. STANDS4 LLC, 2018. Web. 18 Sep. 2018. <https://www.phrases.net/idioms/firm-up>.

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