kingmake

verb2

1. •
   To use one's influence to help someone else into a position of political power.

   • Okay, you get on the extension in the other room and listen to me kingmake Percy President. — 1968
2. •
   To play so as to cause another player to win.

   • I do dislike it if part of the skill of playing consists of manipulating the people who are out of the running to get them to kingmake for you. — 2002