off with someone's head

IPA(Pronunciation)

Phrase

humorous usually

(usually humorous) Used to express a desire to kill the person in question.

Japanese Meaning

（通常は冗談として）対象者の首をはねる、すなわちその人物を殺す意図を表す表現

When he revealed he had eaten the last cookie, she laughed and mock-threatened, 'off with someone's head'.

彼が最後のクッキーを食べてしまったと告げると、彼女は笑いながら冗談混じりに「首をはねてやる」と脅した。

Sense（1）

(usually humorous) Used to express a desire to kill the person in question.