Subo, subas, subâre. Plin. To geunt as the sow doeth, desiring to haue the bore to doe their kinde.
Lewis and Short: Latin dictionary
sŭbo, āre, v. n., to be in heat.I. Prop. of sows, Plin. 10, 63, 83, 181.—II.Transf.A. Of other animals, Lucr. 4, 1199; App. Mag. p. 298, 22.—B. Of women, Hor. Epod. 12, 11; Tert. Apol. 46; 14; Hier. ap. Jovin. 1, 38; 2, 36.