Definition of "jack"
jack2
/d͡ʒæk/
noun
plural jacks
(Canada, US, colloquial) A lumberjack.
(slang, chiefly US) Money.
A pike, especially when young.
(US) A jackrabbit.
(apparently does not occur standalone for the genus per se) Plant of the genus Emex, also considered synonymous to Rumex, if not then containing two species lesser jack and little jack for Emex spinosa syn. Rumex spinosus, Australian English three-corner jack and prickly jack for Emex australis syn. Rumex hypogaeus.
verb
third-person singular simple present jacks, present participle jacking, simple past and past participle jacked
(colloquial, vulgar) To jack off, to masturbate.
adjective
comparative more jack, superlative most jack
(Australia) Tired, disillusioned; fed up (with).
jack3
/d͡ʒæk/