1
general::
Phrase(s): check on someone or something
to look into the legitimacy or condition of someone or something. • Sarah will check on the matter and report to us. • I will check on Jeff while he’s not feeling well.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, check up on;check over. Investigate, scrutinize, or inspect, as in I'll check on the brakes and make sure they're all right, or We need to check up on his work from time to time, or Let's check over the books together. [Late 1800s] Also see CHECK OUT, def. 6.
American Heritage Idioms