see (one) off
To accompany one to the place where they will be departing and wish them farewell. John offered to see me off to the train station, but I was so sad to leave that I preferred to go alone. I'm just going to see our guests off. I'll be back shortly.
see someone off
Take leave of someone, as in We saw our guests off at the door, or They came to the airport to see us off. This expression was first recorded in 1809. Also see see out, def. 1.