Lewis & Short

dē-plĕo, ēvi, 2, v. a., to empty out, to draw off (very rare): oleum, Cato R. R. 64 fin.; Col. 12, 50, 8, and 10: sanguinem, to let blood, to bleed, Plin. 18, 16, 43, § 148; for which, d. animal, Veg. A. V. 1, 13, 4.
Poet., to exhaust, haustu fontes, Stat. Ach. 1, 8: vitam querelis, Manil. 4, 13.