Lewis & Short

sūgo, xi, ctum, 3, v. a. [root svag-; cf. sucus], to suck (class.).

  1. I. Lit.: (animalium) alia sugunt, alia carpunt, Cic. N. D. 2, 47, 122: (agni) matris sugunt mammam, Varr. R. R. 2, 1, 20: porca frequentiore numero sucta deficiet, exhausted, Pall. Febr. 26, 5: terram, to exhaust, Varr. R. R. 1, 44, 3.
  2. II. Trop.: cum lacte nutricis errorem suxisse, to have sucked, imbibed, Cic. Tusc. 3, 1, 2.