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We found 11 dictionaries with English definitions that include the word slack up:
Click on the first link on a line below to go directly to a page where "slack up" is defined.

General (9 matching dictionaries)

1. slack up: Oxford Learner's Dictionaries [home, info]
2. slack up: Vocabulary.com [home, info]
3. slack up: Dictionary.com [home, info]
4. slack up: Rhymezone [home, info]
5. slack up: Free Dictionary [home, info]
6. slack up: Mnemonic Dictionary [home, info]
7. slack up: WordNet 1.7 Vocabulary Helper [home, info]
8. slack up: LookWAYup Translating Dictionary/Thesaurus [home, info]
9. slack up: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

10. slack up: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

11. slack up: Idioms [home, info]

Quick definitions from WordNet (slack up) ▸ verb:  make less active or fast ▸ Words similar to slack up ▸ Usage examples for slack up ▸ Idioms related to slack up (New!) ▸ Words that often appear near slack up ▸ Rhymes of slack up ▸ Invented words related to slack up