on (one's) (own) head(redirected from on their head)
on (one's) (own) head
Being one's sole responsibility to bear. I won't rat you out, but if you get caught cheating it's on your own head! She's the one who cheated, so in my book, their marital troubles are on her head.
on someone's head
Fig. [for something negative] belonging only to one person or group. All the blame fell on their heads. I don't think that all the criticism should be on my head.
on one's head
Also, on one's own head. As one's responsibility or fault, as in If the police catch you speeding it's on your own head. This idiom, dating from the 1300s, conjures up the image of blame or guilt falling on someone's head. Also see off one's head.