A proverb meaning you cannot completely control what people say; you can't stop rumors or public talk.
有名になると、人の口には戸が立てられない。
When you become famous, you can't stop what people say about you.
彼の失敗はすぐに広まり、人の口には戸が立てられなかった。
His failure spread quickly; it was impossible to stop people talking.
親としては恥ずかしいが、人の口には戸が立てられないものだ。
As a parent it's embarrassing, but you can't control what people say.