show (one's) horns

To reveal one's evil or malicious nature. The devil is typically depicted with horns. I thought I could trust Eric until he showed his horns by spreading rumors about me. Jill definitely sabotaged my last two relationships. She might seem nice, but she always shows her horns eventually.

Common Names:

Name	Pronounced	Usage
Jozefien	yo-zə-FEEN	Dutch
HalİDe	-	Turkish
Prateek	-	Indian, Hindi, Marathi, Gujarati, Bengali
Noemin	-	Biblical Greek
Cruz	KROOTH (Spanish), KROOS (Latin American Spanish), KROOSH (Portuguese)	Spanish, Portuguese
Yates	[jeits]