Firm up
verb
To become firmer or stronger.
Your muscles will begin to firm up after a few weeks of workout.

Often appears as...
- start to firm up
- begin to firm up
verb
To make something sure or certain.
They need to firm up the deal before the end of the week.

Often appears as...
- firm up a deal
- firm up an agreement
verb
To become firmer or stronger.
Your muscles will begin to firm up after a few weeks of workout.

Often appears as...
- start to firm up
- begin to firm up
verb
To make something sure or certain.
They need to firm up the deal before the end of the week.

Often appears as...
- firm up a deal
- firm up an agreement
Definition 1 of 2

Physical Strength
Used when referring to the physical body gaining strength or muscle tone.

Even after the injury, you can still firm up your core with exercise.
Progressive Change
Describes a gradual improvement or development in something over time.

Your pasta-making skills will firm up as you practice more.
Not Instant
Emphasizes that firming up is a process, which requires time and persistence.

With consistent effort, your baking results will firm up.
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