appoint (one) to
To assign one a certain title or role. I can hardly believe that the trustees have appointed me to the position of chairman.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
appoint someone to something
to select or assign someone to serve in a particular role. (Usually focusing on the role of the person or on a group of persons with similar roles.) l am going to appoint you to the position of treasurer. Fred tried to appoint himself to the board of directors, but it violated the by-laws.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.