be on the fence

be on the fence

To be unable or unwilling to make a decision or take a side when presented with two opposing options or possibilities. The government has been on the fence about legalizing marijuana for the past two years. You can't be on the fence about this—you need to choose whom we need to fire.
See also: fence, on

on the fence, be

Also, straddle the fence. Be undecided, not committed, as in I don't know if I'll move there; I'm still on the fence, or He's straddling the fence about the merger. This picturesque expression, with its implication that one can jump to either side, at first was applied mainly to political commitments. [Early 1800s]
See also: on