Definition of "firm up" in English

Verb

1. To make (tentative plans) more definite.

   • Can we firm up plans for the barbecue Sunday?

2. To become more definite.

   • Let me know as soon as your plans firm up.

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

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

4. To become more toned through physical exercise.

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

5. To become firmer in consistency.

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