wash one's mouth out

Etymology
From the formerly common practice of punishing children who have lied or used foul language by forcing them to wash their mouths using a cleansing substance, typically soap.

Verb

 * 1)  To stop using bad language, or atone for doing so.

Translations

 * Russian: вымой свой рот с мылом, вымой свой рот, помой рот с мылом