on the edge of seat

on the edge of (one's) seat

Excited, nervous, or filled with suspense while one waits to find out what happens next. Often said of those viewing a movie or TV show. The image is that of one literally sitting on the front of their chair because they are unable to sit back and relax. It's not going to win any awards, but the film certainly kept us on the edge of our seat from start to finish. I've been on the edge of my seat waiting for my acceptance letter.
See also: edge, of, on, seat
Farlex Dictionary of Idioms.

on the edge of one's seat

Fig. [of a member of an audience] closely following the action and excitement of a performance. We sat on the edge of our seats during the entire play.
See also: edge, of, on, seat
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

on the ˌedge of your ˈseat/ˈchair

very excited and giving your full attention to something: The film was so exciting it had me on the edge of my seat right until the last moment.
See also: chair, edge, of, on, seat
Farlex Partner Idioms Dictionary
See also:
  • on the edge of (one's) chair
  • on the edge of (one's) seat
  • on the edge of your seat
  • on the edge of your seat/chair
  • keep (one) on the edge of (one's) chair
  • keep (one) on the edge of (one's) seat
  • keep you on the edge of your seat
  • sit on the edge of (one's) chair
  • sit on the edge of (one's) seat
  • keep (one) in suspense