(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
Makeda	-	History
Leanne	lee-AN	English
Jolyon	-	English (Rare)
Erastus	i-RAS-təs (English)	Biblical, Biblical Latin
Rohesia	-	Medieval English (Latinized)
Tugay	-	Turkish