What is the opposite of slack off?

Need antonyms for slack off? Here's a list of opposite words from our thesaurus that you can use instead.

Verb
Opposite of taper off
Verb
Opposite of take things easy
Verb
Opposite of to relax or take time out
Verb
Opposite of to diminish to nothing
Verb
Opposite of relax after a period of work or tension
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