call upon

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call on

1. To ask one to answer a question, as in a classroom or other academic setting. In this usage, a noun or pronoun is typically used after "on." My son says that he raises his hand in class every day, and the teacher never calls on him. I didn't have an answer ready, but the teacher called on me anyway.
2. To pursue one, often romantically. In this usage, a noun or pronoun is typically used after "on." I don't think he's interested in me, considering how he's been calling on the girl down the street.
3. To ask one to do something. In this usage, a noun or pronoun is typically used after "on." We received an overwhelming response when we called on our members to donate to this very important cause.
4. To utilize something, often a quality or skill. In this usage, a noun or pronoun is typically used after "on." The championship game was so intense that I really had to call on my mental toughness just to get through it.
5. To visit one. In this usage, a noun or pronoun is typically used after "on." I'm sorry I'm late—I called on Maggie after work because her mother just died.
6. To challenge one to prove that one's claims or boasts are true. In this usage, a noun or pronoun is typically used between "call" and "on." He insisted that he could run faster than me, but when I called him on it, he suddenly had to go home. The moderator finally called the candidate on her misleading statements.
7. To confront one about one's misdeeds or unpleasant behavior. In this usage, a noun or pronoun is typically used between "call" and "on." If your intern keeps coming in late, you need to call her on it.
See also: call, on

call upon (someone)

1. To choose, request, obligate, order, or demand someone to do something. Yesterday the president called upon world leaders everywhere to promote open and fair trade between countries. He was called upon to give testimony in court.
2. To visit someone. I went to the East Coast last week to call upon my aunt.
See also: call, upon

call upon

v.
1. To order or require someone to do something: I call upon you to tell the truth.
2. To make a demand or a series of demands on something: Social institutions are often called upon to assist the poor.
3. To visit someone: I called upon an old friend when I was in New York.
4. To make use of some resource; draw on something: I knew the task would call upon my every resource.
See also: call, upon
References in classic literature ?
But Eliza Millward says her father intends to call upon her soon, to offer some pastoral advice, which he fears she needs, as, though she is known to have entered the neighbourhood early last week, she did not make her appearance at church on Sunday; and she - Eliza, that is - will beg to accompany him, and is sure she can succeed in wheedling something out of her - you know, Gilbert, she can do anything.