put someone's back up

idiom

Definition of put someone's back up

: to offend or annoy someone : to make someone angry or ready to argue I don't want to question his decision because that will just put his back up.

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“Put someone's back up.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/put%20someone's%20back%20up. Accessed 26 January 2020.

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