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to firm up
[phrase form: firm]
01
to make a plan, agreement, or decision more definite or secure
02
to make a soft or unstable substance become more solid or stable
Example
The team needs to firm up the details of the project before the presentation.
They are working to firm up a deal with the new supplier.
Let's firm up the schedule for the event to ensure everything runs smoothly.
The custard will firm up as it cools.
The chocolate will firm up in the fridge after you pour it into the mold.
