Here's a breakdown of its meaning:
* Fence: A physical barrier that separates two sides.
* Sitting: Implies inaction and a lack of commitment.
Therefore, "sitting on the fence" suggests someone is remaining neutral and hesitant to take a stand, even though a clear choice needs to be made.
Examples:
* "I can't believe you're still sitting on the fence about the new policy. You need to decide if you're for it or against it!"
* "The company is sitting on the fence about investing in the new project, waiting for the market to stabilize."
The idiom often carries a slightly negative connotation, implying indecisiveness or a lack of courage to take a position.