(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
Aelfric	['ælfrik]
Attfield	['ætfi:ld]
Leon	LEE-awn (English), LE-awn (German, Polish)	English, German, Polish, Slovene, Croatian, Dutch, Ancient Greek
Altair	-	Astronomy, Portuguese (Brazilian)
BonifÁC	-	Czech, Hungarian
Natalka	-	Ukrainian, Polish