sit on the fence

To remain neutral, to refuse to take sides in a dispute; often used in a derogatory way about someone who lacks the courage to decide: “The councilman is afraid he'll lose votes if he takes sides on the zoning issue, but he can't sit on the fence forever.”

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.