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We found one dictionary with English definitions that includes the word slacking up:
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General (1 matching dictionary)

1. slacking up: Vocabulary.com [home, info]

▸ Words similar to slacking up ▸ Usage examples for slacking up ▸ Idioms related to slacking up (New!) ▸ Words that often appear near slacking up ▸ Rhymes of slacking up ▸ Invented words related to slacking up