Usually means: Make more solid or stable.
Definitions Related words Mentions
We found 14 dictionaries that define the word firm up:

General (11 matching dictionaries)
  1. firm up: Merriam-Webster.com
  2. firm up: Vocabulary.com
  3. firm (sth) up: Cambridge Advanced Learner's Dictionary
  4. firm up: Wiktionary
  5. firm up: Dictionary.com
  6. firm up: Rhymezone
  7. firm up: Free Dictionary
  8. firm up: Mnemonic Dictionary
  9. firm up: Dictionary/thesaurus

Business (2 matching dictionaries)
  1. Travel Industry Dictionary (No longer online)
  2. firm up: Legal dictionary

Miscellaneous (1 matching dictionary)
  1. firm up: Idioms

Definitions from Wiktionary (firm up)

verb:  (transitive, idiomatic) To make (tentative plans) more definite.
verb:  (intransitive, idiomatic, of tentative plans) To become more definite.
verb:  (transitive) To make (muscles) more toned through physical exercise.
verb:  (intransitive, of muscles) To become more toned through physical exercise.
verb:  (intransitive) To become firmer in consistency.

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