See in

Hi,
We see the New Year in. Can we see people in? We can see them off, so would “see in” be the opposite?

Thanks.

Yes, sou can. It's another way of saying "escort". You can also see someone home safely, see them to the door, etc.

I don't hear this construction very often (regarding the New Year or otherwise), but Uriel is correct.

But can I see a friend in at the airport = meet?

No, that doesn't sound right to me. To see someone in/out implies motion.

see in = accompany or escort in
see our = accompany or escort out

Thank you.

Correction:

see in = accompany or escort in
see out = accompany or escort out