to become more definite, or to make something more definite
to give someone or something what they need in order to be stronger
to make the muscles in a part of your body stronger
Negotiators will meet later this week to firm up the deal.
They’ve agreed to firm up their peacekeeping force.
Voting preferences have firmed up over the past few months.
firms up
firming up
firmed up
There is no origin for this phrasal verb
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