Longman Dictionary of Contemporary English homepage

firm

3 verb
     
firm3 W3 [transitive]
to press down on soil to make it harder or more solid

firm something ↔ up

phrasal verb
1 to make arrangements, ideas etc more definite and exact:
We're hoping to firm up the deal later this month.
2DSO to make a part of your body have more muscle and less fat by exercising
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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