knuckle sandwich
noun/ˌnʌkl ˈsænwɪtʃ/, /ˌnʌkl ˈsænwɪdʒ/
/ˌnʌkl ˈsænwɪtʃ/, /ˌnʌkl ˈsænwɪdʒ/
(slang)- a hard hit in the mouth made with the fist (= closed hand)
Check pronunciation:
knuckle sandwich
Definition of knuckle sandwich noun from the Oxford Advanced Learner's Dictionary