Question

call on

Accepted Answer

to
  visit:I'll call on our new neighbour tomorrow. 2 ( also call upon: formal) to
  summon or gather together: call on call one's resources. 3 (also call upon)
  to appeal to: They called on God for help. 4 to order to come forward: I
  stopped my car at the halt-sign, but the policemen called me on. 5. (also
  call upon: formal) to ask (someone) formally (to do something): The chairman
  called on each of the four candidates to speak in turn.

Call Called Formal Visit:I'll Neighbour Tomorrow Summon Gather