check on someone/thing
To try to find out the truth or rightness of; make sure of; examine; inspect; investigate.
We checked on Dan's age by getting his birth record.
Mrs. Brown said she heard someone downstairs and Mr. Brown went down to check up on it.
You can check on your answers at the back of the book.
The police are checking up on the man to see if he has a police record.
Grandfather went to have the doctor check on his health.
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Source: A Dictionary of American Idioms