expression, godan verb (-gu)
unmask; expose someone's true nature
Idiomatic expression meaning to reveal someone's hidden true character, especially when they have been pretending to be something they are not. Often used when a deceitful or hypocritical person is exposed.
彼の優しい態度は嘘だった。ついに化けの皮を剥いだ。
His kind attitude was a lie. He was finally unmasked.
記者会見で、その政治家の化けの皮を剥いだ。
At the press conference, they exposed the politician's true nature.