Meaning of the word "knuckle sandwich" in English

What does "knuckle sandwich" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

knuckle sandwich

US /ˈnʌk.əl ˌsænd.wɪtʃ/
UK /ˈnʌk.əl ˌsænd.wɪtʃ/
"knuckle sandwich" picture

Idiom

1.

a punch in the mouth

Example:
If you don't stop talking, you're going to get a knuckle sandwich.
He threatened to give me a knuckle sandwich if I didn't leave.
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