call on
(ask a person or organization to do something)
- The human rights group has called on military leaders to stop killing civilians.
- The teacher always calls on me to answer the tough questions.
- Sometimes we have to call on outside expertise to resolve technical problems.
(visit someone for a short time)
- We went to the hospital in order to call on a sick friend.
- Send me your address, and I’ll call on you when I’m in the area.