set somebody/something against somebody/something phrasal verb (
see also set)
1. to make someone start to fight or quarrel with another person, especially a person who they had friendly relations with before:
The bitter civil war set brother against brother.2. set yourself against (doing) something to decide that you are opposed to doing or having something:
She’s set herself against going to university.3. set something against tax to officially record the money you have spent on something connected with your job, in order to reduce the amount of tax you have to pay
[TahlilGaran] Dictionary of Contemporary English ▲