come down on one side of the fence or the other

Từ điển tiếng Anh - Cambridge Advanced Learners Dictionary

come down on one side of the fence or the other idiom
to make a decision between two opposing points of view
• The election is next week, so you'll have to come down on one side of the fence or other by then.
Thesaurus⁺: ↑Decisions and deciding
Main entry: side_idiom