slack1 Pronunciation: /slæk/Translate slack | into French | into German | into Italian Spanish translation of slackadj (-er, -est) 1 (loose) [rope/cable] flojo 2 (lax, negligent) [student] poco aplicado; [piece of work] flojo 3 (not busy) [period] de poca actividadslack in other Oxford dictionaries Definition of slack in the British & World English dictionary Definition of slack in the US English dictionary