口は災いの元

くちはわざわいのもと

words can lead to disaster; the tongue is the root of calamities; the more you open your mouth the more likely you are to put your foot in it

Also written 口は禍の元

Meanings

Expression
words can lead to disaster; the tongue is the root of calamities; the more you open your mouth the more likely you are to put your foot in itproverb

Example sentences

口くちは災わざわいの元もと。

Out of the mouth comes evil.
口くちは災わざわいの元もと。つまらないことはしゃべらない方ほうがいい。

It's better not to prattle on about meaningless things. The more you open your mouth the more likely you are to put your foot in it.