call upon

Verb

call on (third-person singular simple present calls on, present participle calling on, simple past and past participle called on)

1. (idiomatic, transitive) To visit (a person); to pay a call to.
   • I really should call on my aunt more often.

   Synonyms:

   pay a visit, visit, wait on

2. (idiomatic, transitive) To select (a student in a classroom, etc.) to provide an answer.
   • He sat there, baffled, hoping nobody would call on him.
3. (idiomatic, transitive) To request or ask something of (a person); to select for a task.
   • The king called on his subjects to take up arms and defend the kingdom.

   Synonyms:

   call upon

4. (idiomatic, transitive) To have recourse to.
   • Exhausted, he called on his last ounce of strength.

   Synonyms:

   call upon, summon up

5. (ditransitive, idiomatic, transitive) To correct; to point out an error or untruth.
   • The salesman persisted in quoting a rate higher than was listed, until we called him on it.

   Synonyms:

   correct, call out