世間の口に戸は立てられぬ
Meanings
1
people will talk; you can't stop rumors
Proverb meaning that you cannot prevent people from gossiping or spreading rumors, just as you cannot put a door on everyone's mouth. Often used to express resignation about public opinion.
See also: 人の口に戸は立てられず
People will talk, so it's better not to worry about it.
That rumor has already spread. You just can't stop people from talking.