give (one) (one's) head
To allow one to do what one wants; to grant one more or total freedom. Can you believe the boss gave me my head on this project? Finally, I can present a campaign with my own vision! I'm giving you your head on this project, I hope to see some real innovation.
give somebody their ˈhead
give somebody the freedom to do what they want: We must give the new art teacher her head, so that she has the freedom to do things differently. OPPOSITE: tie somebody’s handsThis idiom refers to allowing a horse to go as fast as it likes when you are riding it.