To plead or pretend poverty. Sc.
1822. Its no right o you to be aye making a puir mouth.Blackwoods Mag., xii. p. 307/1 (Sept.). (N.E.D.)
1859. He lives about six miles from here, an makes a mighty poor mouth about me an my old woman holdin a square mile, when he cant git but half that for him an seven children, bekase his wifes dead.Mrs. Duniway, Captain Grays Company, p. 174 (Portland, Oregon).
1885. You wanted to come here and make a poor mouth to Mrs. Lapham before I got home.W. D. Howells, The Rise of Silas Lapham, ch. xxv. (N.E.D.)