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

 

jack

 verb
verb
BrE BrE//dʒæk//
 
; NAmE NAmE//dʒæk//
 
Verb Forms present simple I / you / we / they jack
BrE BrE//dʒæk//
 
; NAmE NAmE//dʒæk//
 
he / she / it jacks
BrE BrE//dʒæks//
 
; NAmE NAmE//dʒæks//
 
past simple jacked
BrE BrE//ˈdʒækt//
 
; NAmE NAmE//ˈdʒækt//
 
past participle jacked
BrE BrE//ˈdʒækt//
 
; NAmE NAmE//ˈdʒækt//
 
-ing form jacking
BrE BrE//ˈdʒækɪŋ//
 
; NAmE NAmE//ˈdʒækɪŋ//
 
 
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jack something | jack somebody (for something) (North American English, informal) to steal something from somebody, especially something small or of low value Someone jacked my seat. Word Origin late Middle English: from Jack, familiar form of the given name John. The term was used originally to denote an ordinary man, also a youth (mid 16th cent.), hence the ‘knave’ in cards and ‘male animal’. The word also denoted various devices saving human labour, as though one had a helper (sense (1), and in compounds such as jackhammer and jackknife); the general sense ‘labourer’ arose in the early 18th cent. and survives in lumberjack, steeplejack, etc. Since the mid 16th cent. a notion of ‘smallness’ has arisen, hence senses (4) and (5). Phrasal Verbsjack somebody aroundjack in somethingjack somethinginjack offjack upjack somethingup
See the Oxford Advanced American Dictionary entry: jack