Meaning of ばけのかわ in Japanese

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Definition of ばけのかわ

ばけのかわ(bakenokawa) 【化けの皮 ·化の皮】

ばけのかわをはぐ(bakenokawawohagu) 【化けの皮を剥ぐ ·化けの皮をはぐ】

(exp, v5g) to unmask (someone's true nature)
彼の化けの皮をはごうとしたが、むりだった。
I tried in vain to catch him out.

ばけのかわをあらわす(bakenokawawoarawasu) 【化けの皮を現わす ·化けの皮を現す】

(exp, v5s) to expose one's true colors (colours); to expose one's true character