get someone's back up

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get someone's back up (third-person singular simple present gets someone's back up, present participle getting someone's back up, simple past got someone's back up, past participle (UK) got someone's back up or (US) gotten someone's back up)

1. (idiomatic) To annoy or anger someone.
   • 1970, James N. Casavis, Principal's Guidelines for Action in Parent Conferences‎, →ISBN, page 121:

     Telling someone that her child can and should be doing better and not offering some solutions immediately gets my back up.

   That joke really got my boss's back up.

• See Thesaurus:annoy and Thesaurus:enrage

• have one's back up