eat out of someone's hand
Be manipulated or dominated by another, be submissive, as in He had the press eating out of his hand. This metaphoric expression alludes to a tame animal eating out of one's hand. [Early 1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.