What is another word for gotten up on?
Pronunciation: [ɡˈɒtən ˌʌp ˈɒn] (IPA) 
The phrase "gotten up on" can be interpreted in a few different ways, but generally means to become fixated on something or to hold a grudge against someone. Synonyms for this phrase would include holding a vendetta, obsessing over, fixating on, obsessively pursuing, or doggedly pursuing. Other synonyms for getting worked up about something or someone might include getting angry, riled up, upset, or agitated. Some people might say that they are "hot under the collar" or "up in arms" about a certain issue or person. Regardless of the specific phrasing used, it's clear that when someone says they have "gotten up on" something, they are feeling very strongly about it.
