orsus
From LSJ
ὥσπερ ἀνέµου 'ξαίφνης ἀσελγοῦς γενοµένου → just as when a wind suddenly turns foul, just as when a wind suddenly turns nasty
Latin > English (Lewis & Short)
orsus: a, um, Part. and P. a., v. ordior.
orsus: ūs, m., ordior,
I a beginning, commencement; an undertaking, attempt (poet.): pectoris, Cic. poët. Div. 2, 30, 63: tenuis, Verg. Cul. 1.