首くびを洗あらって待まつ

expression, godan verb (-tsu)

wait for one's punishment; prepare to face the consequences

Idiomatic expression, usually used in the imperative as a threat. Literally 'wash your neck and wait' (for beheading). Conveys 'you'll get what's coming to you'.

• 覚かく悟ごしろ。首くびを洗あらって待まっていろ。

  Prepare yourself. Just wait for what's coming to you.

• あんなことをしたんだから、首くびを洗あらって待まつしかない。

  After doing something like that, you can only wait for your punishment.