get one's back up

idiom

: to become angry or annoyed and want to fight or argue

He gets his back up and becomes defensive whenever someone questions his work.

Dictionary Entries Near get one's back up

get one's ass kicked

get one's back up

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“Get one's back up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/get%20one%27s%20back%20up. Accessed 21 Mar. 2023.

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