To settle down carelessly.
1840. Jist come in, and take off your things, and lop down, if youre a mind to, while we re a getting supper.Mrs. Kirkland, A New Home, p. 20.
1878. Id lopped down onto the sofy, when I happened to think Id hev tea early.Rose T. Cooke, Happy Dodd, chap. xxv.