rĕ-no, āvi, ātum, 1, v. n. and a.,
to swim back (very rare): per Stygias aquas, Albin. 1, 432: simul imis saxa renarint Vadis levata, i. e. shall float back to the surface , Hor. Epod. 16, 25: eodem renato stagno, Aug. Civ. Dei, 18, 17.
re-nō (1) āvī, —, āre, to swim back: saxa, i. e. rise to the surface, H. ...
An Elementary Latin Dictionary