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The Collaborative International Dictionary
To call upon

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.

Usage examples of "to call upon".

There was no power of recuperation left, no reserve strength to call upon.

The skills he was forced to call upon differed greatly from those demanded of a fighter.

There was no backup force to call upon, no extra support crew to replace those who had been lost.

It is clear therefore that nothing is greater, and nothing better than to enter into the inner secret place of the mind always and in every tribulation and occurrence, and there to call upon the Lord Jesus Christ himself, our helper in temptations and tribulations, and to humble ourselves there by confession of sin, and praise God and Father himself, the giver of correction and the giver of consolation.

Only Jofre and Taynad had to call upon their stoicism to tramp that path.

What right has this advocate, being but a private person, to call upon his fellow-citizens to do sacrifice to the gods or to the Emperor?