Definition: to go to the airport, station or car with someone who is leaving and say good bye to them
E.g.1: When Kim’s friend left, she took her to the airport to see her off safely.
E.g.2: The car was packed, the visit was over. With sadness we all went outside to see off our cousins. We waved until the car had disappeared round the corner.
This phrasal verb can be separated (e.g.1)