putty in someone's hands

putty in (one's) hands

Easy to control or bend to one's wishes. (Putty is a very malleable material.) Oh, come on, Julia is putty in our hands—we can definitely get her to help us with this prank.
See also: hand, putty

putty in someone's hands

A person who is easily influenced or malleable, as in Dean adored his little granddaughter; he was putty in her hands. This metaphoric term, first recorded in 1924, transfers the malleable quality of putty to human behavior. Also see twist around one's finger.
See also: hand, putty