原形毕露 [- - bì lù]show oneself in one's true colors; be revealed in one's true colors; be seen [revealed] for what it is; betray oneself; completely unmasked [exposed]; expose fully one's true colors; He revealed himself for what he was.; One's features were fully exposed.; One's original form was revealed in the end.; One's true colors were exposed.; reveal one's real nature; show one's true colors; show the (cloven) hoof; show the cloven foot; the appearance of one's true nature:•¶ 我们一贯把他看作朋友， 但在当前的紧急关头中， 他原形毕露了。 We always regard him as a friend, but he showed his colours in the current emergency.
•¶ 我早就认为他迟早会原形毕露的。 I thought he would show the cloven hoof sooner or later.