# firm up

> English word · Verb

## Definitions
1. To make (tentative plans) more definite.
2. To become more definite.
3. To make (muscles) more toned through physical exercise.
4. To become more toned through physical exercise.
5. To become firmer in consistency.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/firm-up