check up on Synonyms

check out look into check into check over go over suss out size up look in flying visit swing by somebody's place pore over dig into check on delve into quick visit pop by for a visit fleeting encounter drop in at place call in on brief visit short visit probe into pay a call conduct an investigation into conduct an inquiry into do your homework go into catch on research probe investigate examine dig consider check audit scan scrutinize size inspect scrutinise double-check look at verify test survey study analyse