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We found 23 dictionaries with English definitions that include the word lighten up:
Click on the first link on a line below to go directly to a page where "lighten up" is defined.

General (15 matching dictionaries)

1. lighten up: Merriam-Webster.com [home, info]
2. lighten up: Vocabulary.com [home, info]
3. lighten up: Macmillan Dictionary [home, info]
4. lighten-up: Wordnik [home, info]
5. lighten up: Cambridge Advanced Learner's Dictionary [home, info]
6. lighten up: Wiktionary [home, info]
7. lighten up: Dictionary.com [home, info]
8. lighten up: Rhymezone [home, info]
9. lighten up: Free Dictionary [home, info]
10. lighten up: Mnemonic Dictionary [home, info]
11. lighten up: WordNet 1.7 Vocabulary Helper [home, info]
12. lighten up: LookWAYup Translating Dictionary/Thesaurus [home, info]
13. lighten up: Dictionary/thesaurus [home, info]

Business (4 matching dictionaries)

14. Lighten up: MoneyGlossary.com [home, info]
15. Lighten up: Bloomberg Financial Glossary [home, info]
16. Lighten Up: Financial dictionary [home, info]
17. lighten up: BusinessDictionary.com [home, info]

Miscellaneous (2 matching dictionaries)

18. Lighten Up: AbbreviationZ [home, info]
19. lighten up: Idioms [home, info]

Slang (2 matching dictionaries)

20. lighten up: American-Australian Slang Dictionary [home, info]
21. lighten up: Urban Dictionary [home, info]

Quick definitions from WordNet (lighten up) ▸ verb:  become lighter ▸ verb:  make lighter or brighter ▸ Words similar to lighten up ▸ Usage examples for lighten up ▸ Idioms related to lighten up (New!) ▸ Words that often appear near lighten up ▸ Rhymes of lighten up ▸ Invented words related to lighten up