firm up

动词

To make (tentative plans) more definite. (transitive) · Can we firm up plans for the barbecue Sunday?
To become more definite. (intransitive) · Let me know as soon as your plans firm up.
To make (muscles) more toned through physical exercise. (transitive) · He hopes to firm up his biceps a bit before meeting the girls.
To become more toned through physical exercise. (intransitive) · After weeks of working out, his biceps finally began to firm up a bit.
To become firmer in consistency. (intransitive) · Cook the omelet until the top has started to firm up.

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