call on

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb idiomatic, transitive To visit (a person); to pay a call to.
• verb idiomatic, transitive To select (a student).
• verb idiomatic, transitive To request or ask something of (a person); to select for a task.
• verb idiomatic To correct; to point out an error or untruth.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb have recourse to or make an appeal or request for help or information to