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Yomi
くちがさけてもいえない
Rōmaji
kuchi ga sakete mo ienai
Type
idiom
Literal Meaning
cannot say even if my mouth gets ripped
Meaning
one will never tell anyone no matter what, one’s lips are completely sealed
Synonym
絶対に言えない
Additional Info
It’s often used to refer to something negative that you’ve done before and that you don’t want to tell anyone about.
Example
今日遅刻した理由が寝坊だなんて口が裂けても言えない
I will never say that I came late today because I overslept.