don't sit on the fence

Don't delay in making a decision or taking a side when presented with two or more options or possibilities. Don't sit on the fence any longer. We need to choose which of the two candidates we're going to hire so they can start work on the new project. The elementary school needs its parking lot expanded before the new school year, so, I implore you, people of the town council—don't sit on the fence. Don't sit on the fence about this, senator. It could be the difference between winning and losing the election.