1 firm up Rate this phrase:(0.00 / 0 votes) Say it
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) Say it
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, 2017. Web. 24 Nov. 2017. <http://www.phrases.net/phrase/firm-up_3614>.

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