keep in suspense
keep (one) in suspense
To cause one to remain in a state of anxious apprehension. Well, don't keep me in suspense—tell me what happened next! The TV show kept audiences in suspense with a big cliffhanger at the end of the season finale.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
keep someone in (a state of) suspense
to make someone wait anxiously for something. Tell us what happened. Don't keep us in a state of suspense. Don't keep me in suspense!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.