Lewis & Short

ē-năto, āvi, 1, v. n., to swim out or away, to escape by swimming (very rare).

  1. I. Lit., Vitr. 6 praef.; Hor. A. P. 20; Phaedr. 4, 21, 14; App. M. p. 121, 3 al.
  2. II. Trop., to extricate one’s self, to get off: reliqui habere se angustius videntur; enatant tamen, Cic. Tusc. 5, 30, 87; Petr. 57, 10.