On the edge of seat - Idioms by The Free Dictionary
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.
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.