on the edge of seat

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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

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