(sitting) on the fence
UNDECIDED, uncommitted, uncertain, unsure, vacillating, wavering, dithering, hesitant, doubtful, ambivalent, in two minds, in a quandary, neutral, impartial, non partisan, open minded, humming and hawing

[TahlilGaran] Dictionary of Contemporary English ▲

on the fence
not able to decide something.
Many consumers are still on the fence, waiting to see if a better, less expensive computer will come along.

Usage notes: often used with sit:
Most people sit on the fence and would rather say "maybe" than "yes" or "no."

[TahlilGaran] English Idioms Dictionary ▲

on the fence
to be undecided
The politician is on the fence about the tax issue.

[TahlilGaran] English Idioms Dictionary ▲

on the fence
adj. or adv. phr. Not able, or not wanting to choose; in doubt; undecided.
■ Often used with "sit".
Jack sat on the fence for a week last spring before he finally joined the track team instead of the baseball team.
Mrs. Jones has decided to vote for the Democrats, but Mr. Jones is still on the fence. See: FENCE-SITTER or FENCE-SITTING.

[TahlilGaran] English Idioms Dictionary ▲