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Recently I noticed that a young girl waited for several hours, so as to be able to pass the break with my younger colleague. So my friend and I took a walk outside.
Though this is not something I expect to have to explain, I still wondered how to politely express it. Obviously I don’t mean they had anything improper in mind. But they could talk without everyone listening.
Would 尊重兩人隱私 sound improper? What are polite expressions?
"Give them some privacy" = "給他們一點私人空間吧"
私人空間 means "private space", To give a person some private space means to leave him alone for a while.
你（你们）能回避一下吗？or 你（你们）方便回避一下吗？more politely asking. If you meant they want to have some privacy and can nicely ask others to leave.
If I get your gist correctly, 3 people are waiting, then a boy arrives, who the girl really wants to see. You say to the other person or persons present:
Let's go outside so they can talk in private.
我们到外面去，让他们单独谈谈。
How about a less direct translation:
不要在那儿当电灯泡。
which roughly translates to something like: don't be a third-wheel over there.
