To call on
|To make a short visit to; as, call on a friend.|
|To appeal to; to invite; to request earnestly; as, to call upon a person to make a speech.|
|To solicit payment, or make a demand, of a debt.|
|To invoke or play to; to worship; as, to call upon God.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.