on the edge of seat
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on the edge of (one's) seat
Excited, nervous, or filled with suspense while one waits to see what happens next. Typically 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 Oscars, but the film certainly kept us on the edge of our seats from start to finish. Her character is so deliciously sinister and conniving that I was always on the edge of my seat to see what she would do next.
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.