Desumo, desúmis, pen prod. desumpsi, desumptum, desúmete. Liu.To take out: to choose.Desumere sibi aliquem hostem, Liu.To choose one to make warre vppon.
Lewis and Short: Latin dictionary
dē-sūmo, mpsi (msi), 3, v. a.Lit., to take for one's self from a multitude or mass; hence, to pick out, choose, select (syn. deligere); to take upon one's self, undertake (rare, and perh. not ante-Aug.— syn. suscipere): sibi consules asservandos desumunt, Liv. 4, 55, 3: sibi hostes, id. 38, 45; cf.: sibi pugnas, Tac. Or. 37; and: cursum certamenque, Plin. Ep. 8, 20, 7: sibi vacuas Athenas, Hor. Ep. 2, 2, 81.