Definition of slack verb from the Oxford Advanced Learner's Dictionary

 

slack

 verb
verb
BrE BrE//slæk//
 
; NAmE NAmE//slæk//
 
Verb Forms present simple I / you / we / they slack
BrE BrE//slæk//
 
; NAmE NAmE//slæk//
 
he / she / it slacks
BrE BrE//slæks//
 
; NAmE NAmE//slæks//
 
past simple slacked
BrE BrE//slækt//
 
; NAmE NAmE//slækt//
 
past participle slacked
BrE BrE//slækt//
 
; NAmE NAmE//slækt//
 
-ing form slacking
BrE BrE//ˈslækɪŋ//
 
; NAmE NAmE//ˈslækɪŋ//
 
 
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[intransitive] to work less hard than you usually do or should do Word Originverb Old English slæc ‘inclined to be lazy, unhurried’, of Germanic origin; related to Latin laxus ‘loose’. Phrasal Verbsslack off (on something)
See the Oxford Advanced American Dictionary entry: slack