knuckle sandwich 
noun informal
A punch in the mouth.If you are not, then let me know and I will try to persuade you further - with a knuckle sandwich!...
- The short one, David, delivered a knuckle sandwich, which was also blocked.
- He and Sam both gave me a double knuckle sandwich.
- protomer
- protomeric
- protomeristem
- protomerite
- protometabolism
- protomoon
- protomorph
- protomorphic
- proto-music
- protomê
- proton
- proton accelerator
- proton-accepting
- proton acceptor
- protonate
- protonation
- proton-donating
- proton donator
- proton donor
- protonema
- protonemal
- protonematal
- protoneolithic
- protonephridial
- protonephridium