expression, i-adjective
wouldn't say it even if my mouth were torn apart; I would never say that
A strong idiomatic expression meaning one absolutely refuses to say something, no matter what. Often used when the speaker feels the statement is too embarrassing, shameful, or secret to utter.
彼の秘密は口が裂けても言えない。
I would never tell his secret, no matter what.
口が裂けても言えない
I would never say it out loud, but actually I regret it deeply.