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.
Cite this Entry
“Get one's back up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/get%20one%27s%20back%20up. Accessed 29 Nov. 2025.
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