(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
King	[kiŋ]
Marcy	MAHR-see	English
Bibiana	bee-BYAH-nah (Italian, Spanish)	Italian, Spanish, Late Roman
TÚ	-	Vietnamese
Slavica	-	Serbian, Croatian, Slovene, Macedonian
Filipe	fee-LEEP, fee-LEE-pə	Portuguese