be honor-bound(redirected from honour-bound to do something)
To be or feel obliged (to do something) because it is morally correct or required by one's sense of duty or integrity, even if one does not desire to do so. It pains me to turn you in to the police, my friend, but I am honor-bound to inform them of your actions.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.