intransitive verb
Etymology: Middle English loken in, from looken, loken to look + in
1. : to direct one's gaze to the interior of something
children … look in at the open door — H.W.Longfellow
2. : to enter (as a room or building) for the purpose of seeing someone : make a short call : visit
persuaded him to look in for a cup of tea whenever he visited the hamlet — Flora Thompson
the doctor looked in frequently
3. : to watch television