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Definition of jack squat in English:

jack squat

noun

slang US

  • Nothing at all; (in negative constructions) anything at all. Compare jack-all , "jackshit".

Pronunciation

jack squat

/ˌdʒak ˈskwɒt/ /ˈdʒak ˌskwɒt/

Origin

1980s. From Jack + squat.