have (someone) on a string
To have great influence over someone. If you want to have someone on a string, flattery always helps. The performer was electrifying, and he had the entire audience on a string by the end of the show. Because of the debt he owes her, she'll always have him on a string.
keep (one) on a string
To maintain great influence over one. If you want to keep someone on a string, flattery always helps.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.