on your head be it

on (one's) (own) head be it

The blame, consequences, or responsibility of a risky, dangerous, or foolish decision or action belongs to someone and no one else. If she wants to quit a high-paying job to chase after some fantasy of being a travel writer, then on her head be it.See also: head, on

on your head be it

or

on your own head be it

mainly BRITISHYou say on your head be it or on your own head be it to tell someone that they must accept the consequences of a particular action. This is not the time for such a discussion. But if you insist, on your head be it. If you choose to ignore my generous offer, then on your own heads be it.See also: head, on

on your (own) head be it

used to indicate that you think someone should take full responsibility for anything that goes wrong if they persist in an inadvisable course of action.See also: head, on