首くびが飛とぶ

expression, godan verb (-bu)

be fired; be sacked; be dismissed

Idiomatic expression literally meaning 'one's neck flies off', used for losing one's job, especially in a sudden or forced manner.

• 不ふ祥しょう事じが発はっ覚かくして、部ぶ長ちょうの首くびが飛とんだ。

  The scandal came to light and the department head got fired.

• あのミスで、君きみの首くびが飛とぶかもしれないよ。

  That mistake might cost you your job.