keep you on the edge of your seat
keep (one) on the edge of (one's) seat
To make someone (especially a member of an audience) feel very excited, nervous, or filled with suspense while they wait to see what happens next. (Most often said of films.) It's not going to win any Oscars, but the film certainly kept us on the edge of our seats the entire time! Her character is so sinister and conniving that she keeps you on the edge of your seat whenever she's on screen.
keep you on the edge of your seat
BRITISH orkeep you on the edge of your chair
AMERICANIf a film, programme or performance keeps you on the edge of your seat, it is very exciting and makes you watch with great concentration, wanting to know what will happen next. Based on the Stephen King book, it is the kind of story that keeps you on the edge of your seat throughout. Note: You can also say something has you on the edge of your seat or chair. Saturday night's final had the spectators on the edge of their seats. Note: You can also say edge-of-the-seat before a noun. It's a real action-packed edge-of-the-seat thriller.