Usually means: Reduce tension or intensity gradually.
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We found 10 dictionaries that define the word slack up:

General (8 matching dictionaries)
  1. slack up: Oxford Learner's Dictionaries
  2. slack up: Vocabulary.com
  3. slack up: Dictionary.com
  4. slack up: Rhymezone
  5. slack up: FreeDictionary.org
  6. slack up: Mnemonic Dictionary
  7. slack up: TheFreeDictionary.com
  8. slack up: Wiktionary

Computing (1 matching dictionary)
  1. slack up: Encyclopedia

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

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Definitions from Wiktionary (slack up)

▸ verb:  (intransitive) To slack; to let one's standards slip

Similar:
slack, slacken, slack off, slacker, loosen up, ease off, laxness, slow down, let up, lighten up, more...



▸ Words similar to slack up

▸ Usage examples for slack up

▸ Idioms related to slack up

▸ Wikipedia articles (New!)

▸ Words that often appear near slack up

▸ Rhymes of slack up

▸ Invented words related to slack up

Similar:
slack, slacken, slack off, slacker, loosen up, ease off, laxness, slow down, let up, lighten up, more...



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