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Verb: call on
Meaning: to visit
I called on her.
I called on Judy.
I often call on him.
When I called on him, he was not at home.
You had better make sure that he is at home before you call on him.
You had better make sure that he is at home, before you call on him.
He wasn’t at home when I called on him.
He called on me at my office yesterday.
I’ll call on you at your office tomorrow.
A friend of mine called on me at my office.
We must avoid calling on others without an appointment.
It is against etiquette to call on a person early in the morning.
When I called on him, he was talking on the phone.
May I call on you at your house tomorrow morning?
I’ll call on him tomorrow.
He called on me yesterday.
Verb: call on
Meaning: to ask someone to do something
We called on his aid.
The President called on everyone to save energy.
The president called on the people to unite in fighting poverty and disease.
The committee called on all nations to work side-by-side to curb air pollution.
And I call on the chairman of the Education Committee to support the motion.
The court called on the lawyer to give evidence.
They called on him to provide evidence.
They called on us to do something to help the victims.
We called on him for a speech.
He called on state troops to end the strike.
We will have to call on our friends to help us.
Meaning: Challenge
He CALLED the speaker ON several mis-statements of fact.