Excuse me for a minute. Excuse me for a moment.
如果你的“一下”稍微久一点,还可以说 Excuse me for a (little) while.
礼貌客气一点就在前面加“Please”
再客气一点就再在前面加“Could/Would you”变成问句.征求对方意见.
举例：Please excuse me for a minute.
Could you please excuse me for a minute?
Would you please excuse me for a little while.
望采纳,谢谢.