swear on (one's) mother's grave

To make a very serious, solemn pledge, especially that one is telling the truth. Janet has sworn on her mother's grave that she wasn't the one to betray me, and I believe her. I swear on my mother's grave that if I have a chance to help your campaign, I will.

See also: grave, on, swear

See also:

drive (one) out of office
force (one) out of office
force out of office
give (one) (one's) head
give somebody their head
give someone his or her head
give someone his/her head, to
(something) pays for itself
as one door closes, another (one) opens

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