on the fence
US /ɑn ðə fɛns/
UK /ɑn ðə fɛns/

1.
猶豫不決, 中立
undecided or neutral about something
:
•
I'm still on the fence about whether to take the new job offer.
我還在猶豫不決是否接受新的工作機會。
•
The committee is on the fence about the proposed changes.
委員會對提議的修改猶豫不決。