fence sitter
/ˈfɛns ˌsɪtər/
noun
- A person who avoids taking a side in a debate or conflict; someone who remains neutral or undecided.
- Fence-sitters often wait to see which way the majority is leaning before deciding.
- The candidate tried to win over the fence-sitters with a strong speech.
- In the argument about the new policy, he was a fence-sitter and refused to choose a side.
Antonyms