Meanings
How to pronounce "call on":
AU
To visit (a person); to pay a call to.
Example: "I really should call on my aunt more often."
To select (a student in a classroom, etc.) to provide an answer.
Example: "He sat there, baffled, hoping nobody would call on him."
(also call upon) To request or ask something of (a person); to select for a task.
Example: "The king called on his subjects to take up arms and defend the kingdom."
(also call upon) To have recourse to.
Example: "Exhausted, he called on his last ounce of strength."
To correct; to point out an error or untruth.
Example: "The salesman persisted in quoting a rate higher than was listed, until we called him on it."