in-sībĭlo, 1, v. n. and a.,
to hiss , whistle , or rustle in (poet.): Eurus, Ov. M. 15, 603: ignis membris, Sil. 12, 616: Erinys atros insibilat ore tumores, hisses in , breathes in , with a hissing noise , id. 2, 626.
īn-sībilō —, —, āre, to whistle within: ubi insibilat Eurus, O. ...
An Elementary Latin Dictionary