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English definition of “slack”

slack

adjective uk   /slæk/ us  

slack adjective (NOT TIGHT)

not tight; loose: These tent ropes are too slack - they need tightening.

slack adjective (NOT ACTIVE)

showing little activity; not busy or happening in a positive way: Business is always slack at this time of year.disapproving Discipline in Mr Brown's class has become very slack recently.disapproving The job is taking a long time because the workmen are so slack.
slackly
adverb uk   /ˈslæk.li/ us  

slack

noun uk   /slæk/ us  

slack noun (NOT TIGHT)

[U] the fact that something is too loose: There's too much slack in these ropes. The men pulled on the ropes to take up the slack (= to tighten them).

slack noun (TROUSERS)

slacks [plural] old-fashioned a pair of trousers, usually of a type that fit loosely

slack noun (COAL)

[U] very small pieces and dust from coal

slack

verb [I] uk   /slæk/ informal us  
to work more slowly and with less effort than usual, or to go more slowly: Everyone slacks off/up a bit at the end of the week.disapproving You'll be in trouble if you're caught slacking on the job like that. Slack off your speed as you approach the corner.
(Definition of slack from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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