θρῴσκω From Root ΘΟΡ, which appears in fut. and aor2.
I.to leap, spring, ἐκ δίφροιο, ἀπὸ λέκτροιο Hom.; of arrows, ἀπὸ νευρῆφι θρῶσκον Il.; of the oar, Soph.
2.foll. by prep. to leap upon, i. e. attack, assault, ἐπὶ Τρώεσσι θόρον Il.: —of a recurring illness, to attack, Soph.