keep (one) on tenterhooks
To cause one to remain in a continual state of anxious, excited, or nervous anticipation. "Tenterhooks," often mistakenly written or pronounced as "tenderhooks," were the hooks on a frame called a "tenter." They were used to fasten stretched cloth to allow it to dry. With the score tied, fans on both sides were kept on tenterhooks for the entire last quarter of the game. They said they would let me know about my application soon. I wish they wouldn't keep me on tenterhooks like that!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.