I'll have to settle up what I owe for the phone.

我得付清所欠的电话费。

《柯林斯英汉双解大词典》

Time to settle up.

时间要结束了。

youdao

He needed ten yuan to settle up this bill.

他需要十块钱来付清这一帐单。

youdao

The cattlemen finally had to settle land of their own, putting up fences and cutting the size of their herds.

VOA: special.2010.03.18

My advice in many of these cases is to settle up on taxes on your end and move on.

FORBES: Ask the taxgirl: Getting Paid Under the Table

In pre-1971 days, nations had to settle up on their trade balances.

FORBES: Occupy Wall Streeters Should Be Livid About Losing The Gold Standard

What's worse, there's no playbook for how to settle up.

FORBES: Magazine Article