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slack

noun [U] (NOT TIGHT)
 
 
/slæk/

Definition

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).Flexible, loose and yielding
(Definition of slack noun (NOT TIGHT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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