Select the most appropriate meaning of the given idiom.

Call upon

To order

The most appropriate meaning of the idiom "call upon" is to order.

The idiom is used to describe asking someone to do something, especially something important or difficult. For example, you might say that a leader calls upon the people to fight for their freedom, or that a teacher calls upon a student to answer a question.

The other options are not as accurate descriptions of the idiom.

• To adjust means to make something fit or suitable, which is not the same as ordering someone to do something.
• To stop means to bring something to an end, which is not the same as ordering someone to do something.
• To follow means to go or move in the same direction as someone else, which is not the same as ordering someone to do something.