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
Varinius	-	Ancient Roman
Coleman	['kəulmən]
LuÍS	loo-EESH	Portuguese
Nathaniel	nə-THAN-ee-əl (English), nə-THAN-yəl (English)	English, Biblical
Hermanni	HER-mahn-nee	Finnish
Zehra	-	Turkish