(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
Angelo	AHN-je-lo	Italian
Rade	-	Serbian, Croatian
Ptolemy	TAHL-ə-mee (English)	History
Booker	['bukə]
Sergei	syer-GYAY (Russian), seer-GYAY (Russian)	Russian, Bulgarian
Zlatica	-	Croatian, Czech, Slovak