Have one in the palm of one's hand - Idioms by The Free Dictionary
have (someone) in the palm of (one's) hand (redirected from have one in the palm of one's hand)
have (someone) in the palm of (one's) hand
To have great influence over someone. If you want to have someone in the palm of your hand, flattery always helps.
have (or hold) someone in the palm of your hand have someone under your control or influence.
have somebody in the ˌpalm of your ˈhand have somebody completely under your control or influence: Her boyfriend will do anything for her; she’s got him in the palm of her hand.