play a waiting game
Delay an action or decision so as to force an opponent to move or to gain additional information. For example, The lawyer advised her to play a waiting game and see if her husband would come up with more alimony. [Late 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.