Definition of slack verb from the Oxford Advanced American Dictionary

 

slack

 verb
verb
NAmE//slæk//
 
[intransitive]Verb Forms present simple I / you / we / they slack
 
he / she / it slacks
 
past simple slacked
 
-ing form slacking
 
 
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to work less hard than you usually do or should do Phrasal Verbsslack off (on something)
See the Oxford Advanced Learner's Dictionary entry: slack