Lewis Short
(verb) : subter-flŭo, ĕre
* To flow beneath (post-Aug. and very rare).
* Lit.: amnis sub montes subterfluens,Vitr. 8, 2 med.: torrente subterfluente,Plin. 8, 50, 76, § 201: aquae,Sen. Q. N. 3, 30, 4, acc. to Fickert and Haase (not subinfluo).
* Trop.: eos felicitas ingrata subterfluit,Eum. Pan. Const. 15.
Charlton T. Lewis, Charles Short, A Latin Dictionary