Lewis & Short

dē-plango, nxi, 3, v. a., to express grief by beating the breast; to bewail, lament (poet. and very rare): Cadmeida palmis Deplanxere domum, Ov. M. 4, 546; 14, 580; Sen. Herc. Oet. 1852: antiqua peccata, Hier. Jes. 1, 1, 1.