人の口に戸は立てられぬ
Meanings
1
expression, noun-modifying (irregular)
you can't control what people say; you can't stop rumors
Proverb meaning that just as you cannot put a door on people's mouths, you cannot prevent gossip or rumors from spreading.
See also: 人の口
They say you can't put a door on people's mouths, so you shouldn't worry too much about it.