have one's back up

Verb

idiomatic

(idiomatic) To be angry or defensive.

Japanese Meaning

怒っている、または防御的な態度を取る

It's easy to have one's back up when people make assumptions about your motives.

人があなたの動機について憶測をすると、つい身構ってしまいがちだ。

Sense（1）

(idiomatic) To be angry or defensive.

He's had his back up all morning. There's no point in trying to talk to him.

has one's back up

（ present singular third-person ）

having one's back up

（ participle present ）

had one's back up

（ participle past ）

had one's back up

（ past ）