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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.

Opposite of to reduce the force of something
Opposite of to live or work less actively or intensely
To tighten, especially one's muscles
“I stand on my tip-toes and flex every muscle in my body that I can.”
To hasten the progress of or make easier
“The two leaders agreed on the need to speed up efforts to resume a serious peace process.”
To strive in pursuit of a goal
“I would struggle to learn Japanese for the best part of five years until it finally clicked.”
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