Definition of jack-all in English:

jack-all

noun

slang
  • Nothing at all; (in negative constructions) anything at all; the least thing. Compare "jackshit", jack squat .

Origin

1960s; earliest use found in Alan Sillitoe (1928–2010), novelist. From Jack + all [noun].

Pronunciation

jack-all

/ˌdʒakˈɔːl/ /ˈdʒakˌɔːl/