marrowbone

1. (humorous, chiefly in the plural) The shins or knees, chiefly in references to kneeling.Examples: "Upon this condescension, the culprit was called up stairs^([sic]), and made acquainted with the mitigation of his fate; upon which he said, he would down on his marrow-bones to his own master, but would be damn'd before he would ask pardon of e'er a Frenchman in Christendom."; "So the news of the split between the old and the young one caused plenty of conversation, you may be sure; and will Mr. Robert go down on his marrowbones? and what has he done? was all the question."; "They would all to a man have gone down on their marrowbones to him."humorousin-plural