(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
Brigita	-	Slovene, Croatian, Latvian
Wolfgang	VAWLF-gahng (German), WUWLF-gang (English)	German, Ancient Germanic
Calogero	kah-lo-JE-ro	Italian
Enrico	en-REE-ko	Italian
Bede	BEED (English)	History
Zuberi	-	Eastern African, Swahili