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English definition of “slack off”

slack off

phrasal verb with slack
 
 
/slæk/ verb
if someone slacks off, they stop working hard or putting effort into something: Companies just want to make sure their employees aren't slacking off. He urged Washington not to slack off in its development of new energy sources.
if the rate of activity, development, etc. slacks off, it becomes less strong or happens less quickly: Business has slacked off so much that he spends his days remodeling the store. → Compare slacken → See also cyberslacking
(Definition of slack off from the Cambridge Business English Dictionary © Cambridge University Press)
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