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to firm up
[phrase form: firm]
01
to make a plan, agreement, or decision more definite or secure
Examples
The team needs to firm up the details of the project before the presentation.
We must firm the arrangements up quickly for the conference.
02
to make a soft or unstable substance become more solid or stable
Examples
The custard will firm up as it cools.
Allow the concrete to firm up before removing the mold.
