give someone his or her head(redirected from let someone have his)
give (one) (one's) head
To let one do as one wishes; to grant one more freedom. I'm so glad my parents gave me my head—now, I can finally stay out until midnight on the weekends! I'm giving you your head on this project, and I hope to see some real innovation with it.
give someone his or her head
Also, let someone have his or her head. Allow someone to proceed as he or she wishes, give someone freedom. For example, He usually gave his assistant his head when it came to scheduling appointments, or Sometimes it's wise for parents to let a teenager have his head. This expression alludes to loosening a horse's reins and letting it go where it wants to. [Second half of 1500s]