(one's) back is up

One is angry, hostile, defensive, or irritable, often due to a particular cause. John's back is up now. You shouldn't have brought up the subject of college. It's election season, so my dad's back is up all the time.

Common Names:

Name	Pronounced	Usage
Apurva	-	Indian, Hindi, Marathi
Pavle	-	Serbian, Macedonian, Croatian, Georgian
Liljana	-	Macedonian
Torny	-	Norwegian
Zahi	-	Arabic
Beorhtsige	-	Anglo-Saxon