Wiktionary
check up
vb. To verify through brief investigation or examination; to revisit for assurance that there are no problems.
Usage examples of "check up".
In fact, she didn't like anyone who had the power to come in here and check up on her.
But anybody could have hired him to check up on you, on some pretext or other.
Fernack said ponderously, "I had to check up on the other guests in the hotel.