(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
Imam	-	Arabic
Gracia	GRAH-thyah (Spanish), GRAH-syah (Latin American Spanish)	Spanish
Teigue	-	Irish
Odovacar	o-do-VAY-kər (English)	Ancient Germanic
Lanre	-	Western African, Yoruba
Adedayo	-	Western African, Yoruba