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intransitive verb
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Synonyms
chill, chill out [slang], de-stress, decompress, mellow (out), relax, unwind, wind down
Antonyms
tense (up)
1922, in the meaning defined above
More from Merriam-Webster on loosen up
Rhyming Dictionary: Words that rhyme with loosen up
Thesaurus: All synonyms and antonyms for loosen up
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