Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
ρέγχεισ snore LXX.Jonah.1.6
έρεγχε snored LXX.Jonah.1.5

Liddell-Scott-Jones

ῥέγχω (rhegchō) to snore G:V

Included with: ῥέγχω-ω,

snore, [Refs 5th c.BC+]; of horses, snort, [Refs 5th c.BC+]; of a dolphin asleep, [Refs 5th c.BC+]middle ῥέγχωεται, but (as Scholia observes) only to balance πέρδετα; but compare [same places] below—The form ῥέγχω occurs in [LXX+5th c.BC+]middle, τῆς πλευρᾶς ῥέγχομαι I am wheezing from my lung, [Refs 3rd c.AD+]

LSJ Scripture Refs: LXX.Jonah.1.5