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
Dharma	-	Indian, Hindi, Telugu, Nepali
Livia (2)	LIV-ee-ə	English
Emery	EM-ə-ree	English
Anu (1)	AH-noo	Finnish, Estonian
Jos	YAWS	Dutch
Ysolt	-	Arthurian Romance