We found 4 dictionaries that define the word get someone's back up:

General (3 matching dictionaries)

1. get someone's back up: Oxford Learner's Dictionaries
2. get someone's back up, get someone's back up: Collins English Dictionary
3. get someone's back up: Wiktionary

Miscellaneous (1 matching dictionary)

4. get someone's back up: Idioms

Definitions from Wiktionary (get someone's back up) ▸ verb:  (idiomatic) To annoy or anger someone. ▸ Words similar to get someone's back up ▸ Usage examples for get someone's back up ▸ Idioms related to get someone's back up ▸ Wikipedia articles (New!) ▸ Words that often appear near get someone's back up ▸ Rhymes of get someone's back up ▸ Invented words related to get someone's back up