From Longman Dictionary of Contemporary Englishlook in phrasal verb informalVISITto make a short visit to someone, while you are going somewhere else, especially if they are ill or need help SYN drop in, call in on I promised to look in on Dad and see if he’s feeling any better. → look→ See Verb table
Examples from the Corpus
look on• I promised to look in on Dad and see if he's feeling better.• But first he stopped to look in on Grace Sands.• Could you go up and look in on Granny for a minute?• She thought about Francesca, facing this operation alone, and decided to look in on her later that day.• He knew the grandmother and occasionally looked in on her.• When the First Lady looked in on him and discovered he was missing, she panicked and sounded the alarm.• Raymond has one blank eye, looking in on himself, in the mask-like side of the painting.• A hunter passing by looked in on the grandmother and found the wolf.• I looked in on them fairly frequently after that.• I looked in on you a short while ago and you were fast asleep.• Tom will look in on you later to see if you need anything.look-inˈlook-in noun → get/have a look-inExamples from the Corpus
look-in• Torque-steer wouldn't get a look-in.• When it comes to the 3,000 metres steeplechase, no other country gets a look-in.• The party hardly got a look-in. 