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We found 18 dictionaries with English definitions that include the word loosen up:
Click on the first link on a line below to go directly to a page where "loosen up" is defined.

General (14 matching dictionaries)

1. loosen up: Merriam-Webster.com [home, info]
2. loosen up: Oxford Dictionaries [home, info]
3. loosen up: Vocabulary.com [home, info]
4. loosen up: Macmillan Dictionary [home, info]
5. loosen (sb) up, loosen (sth) up: Cambridge Advanced Learner's Dictionary [home, info]
6. loosen up: Dictionary.com [home, info]
7. loosen up: Rhymezone [home, info]
8. loosen up: Free Dictionary [home, info]
9. loosen up: Mnemonic Dictionary [home, info]
10. loosen up: WordNet 1.7 Vocabulary Helper [home, info]
11. loosen up: LookWAYup Translating Dictionary/Thesaurus [home, info]
12. loosen up: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

13. loosen up: Encyclopedia [home, info]

Miscellaneous (2 matching dictionaries)

14. loosen up: Encyclopedia of Graphic Symbols [home, info]
15. loosen up: Idioms [home, info]

Slang (1 matching dictionary)

16. loosen up: Urban Dictionary [home, info]

Quick definitions from WordNet (loosen up) ▸ verb:  become less tense, less formal, or less restrained, and assume a friendlier manner ▸ verb:  become less tense, rest, or take one's ease ▸ verb:  cause to become unblocked ▸ verb:  make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity ▸ verb:  cause to feel relaxed ▸ Words similar to loosen up ▸ Words that often appear near loosen up ▸ Rhymes of loosen up ▸ Invented words related to loosen up