
Firm up
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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