firm up

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firm up (third-person singular simple present firms up, present participle firming up, simple past and past participle firmed up)

1. (transitive, idiomatic) To make (tentative plans) more definite.

   Can we firm up plans for the barbecue Sunday?

2. (intransitive, idiomatic, of tentative plans) To become more definite.

   Let me know as soon as your plans firm up.

3. (transitive) To make (muscles) more toned through physical exercise.

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

4. (intransitive, of muscles) To become more toned through physical exercise.

   After weeks of working out, his biceps finally began to firm up a bit.

5. (intransitive) To become firmer in consistency.

   Cook the omelet until the top has started to firm up.