What's biting?

What's biting somebody?

(informal)

something that you say in order to ask why someone is in a bad mood What's biting her? She hasn't said a word all morning.

Name	Pronounced	Usage
Acton	['æktən]
Elfrida	-	English (Rare)
Cyrillus	-	Ancient Greek (Latinized)
Terah	TEE-rə (English)	Biblical
Rayner	RAY-nər	English (Archaic)
Kustaa	KOOS-tah:	Finnish