Usually means: Make mood or atmosphere lighter.
Definitions Related words Phrases Mentions
We found 22 dictionaries that define the word lighten up:

General (13 matching dictionaries)
  1. lighten up: Longman Dictionary of Contemporary English
  2. lighten up: Merriam-Webster
  3. lighten up: Vocabulary.com
  4. lighten-up: Wordnik
  5. lighten up: Cambridge Advanced Learner's Dictionary
  6. lighten up: Wiktionary
  7. lighten up: Dictionary.com
  8. lighten up: Rhymezone
  9. lighten up: FreeDictionary.org
  10. lighten up: Mnemonic Dictionary
  11. lighten up: TheFreeDictionary.com

Business (4 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Lighten up: Bloomberg Financial Glossary
  3. Lighten Up: Financial dictionary
  4. BusinessDictionary.com (No longer online)

Miscellaneous (2 matching dictionaries)
  1. AbbreviationZ (No longer online)
  2. lighten up: Idioms

Slang (3 matching dictionaries)
  1. lighten up: Green’s Dictionary of Slang
  2. American-Australian Slang Dictionary (No longer online)
  3. lighten up: Urban Dictionary

Definitions from Wiktionary (lighten up)

verb:  (idiomatic, intransitive, transitive) To make (something) or to become less serious and more cheerful or casual; to relax.
verb:  (transitive) To lighten (something): to decrease its weight.

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