on the fence

on the fence

Not making a decision or taking a side when presented with two options or possibilities; undecided. You can't stay on the fence any longer—you need to choose which of the two candidates we should hire. The committee has been on the fence about the issue for years, so don't expect any action any time soon.
See also: fence, on
Farlex Dictionary of Idioms.

*on the fence (about something)

Fig. undecided about something. (*Typically: be ~; sit ~.) Ann is on the fence about going to Mexico. I wouldn't be on the fence. I'd love to go.
See also: fence, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

on the fence

Informal
Undecided as to which of two sides to support; uncommitted or neutral.
See also: fence, on
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • sit on the fence
  • straddle
  • straddle the fence
  • on the fence, be
  • on the fence, to be/sit
  • be on the fence
  • pull (one) off the fence
  • be sitting on the fence
  • come off the fence
  • fence hanger