Lewis Short
(verb) : cernŭo, āvi, ātum, 1, and n. cernuus
* To throw or fall head foremost (only ante- and post-class.), Varr. ap. Non. p. 21, 8; App. M. 1, 19, p. 111, 9; Front. Princ. Hist. 5.—In dep. form: tigres cernuantur,Sol. 17: equus de industriā cernuatus,id. 45.
Charlton T. Lewis, Charles Short, A Latin Dictionary