have one's back up
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English[edit]
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Audio (AU) (file)
Verb[edit]
have one's back up (third-person singular simple present has one's back up, present participle having one's back up, simple past and past participle had one's back up)
- (idiomatic) To be angry or defensive.
- He's had his back up all morning. There's no point in trying to talk to him.