What is "to call on"

Call \Call\, v. i.

1. To speak in loud voice; to cry out; to address by name; -- sometimes with to.

   You must call to the nurse.
   --Shak.

   The angel of God called to Hagar.
   --Gen. xxi. 17.

2. To make a demand, requirement, or request.

   They called for rooms, and he showed them one.
   --Bunyan.

3. To make a brief visit; also, to stop at some place designated, as for orders. He ordered her to call at the house once a week. --Temple. To call for

   1. To demand; to require; as, a crime calls for punishment; a survey, grant, or deed calls for the metes and bounds, or the quantity of land, etc., which it describes.

   2. To give an order for; to request. ``Whenever the coach stopped, the sailor called for more ale.'' --Marryat. To call on, To call upon,

      1. To make a short visit to; as, call on a friend.

      2. To appeal to; to invite; to request earnestly; as, to call upon a person to make a speech.

   3. To solicit payment, or make a demand, of a debt.

   4. To invoke or play to; to worship; as, to call upon God.

      To call out To call or utter loudly; to brawl.