a. [ Lop + side. Cf. Lobsided. ] 1. Leaning to one side because of some defect of structure; as, a lopsided ship. Marryat. [ 1913 Webster ]
2. Unbalanced; poorly proportioned; having much more on one side than the other; -- also used metaphorically; as, a lopsided victory. [ 1913 Webster +PJC ]
3. Full of idiosyncrasies. J. S. Mill. [ 1913 Webster ]
n. A victory in a contest in which one side defeats the other overwhelmingly; -- in sports, meaning one side scores much more than the other; in war, meaning one side has many more casualties than the other. [ PJC ]