Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
υπερεχύθη overflowed LXX.Lam.3.54
υπερεκχυθήσονται shall be overflowing LXX.Joel.2.24

Liddell-Scott-Jones

ὑπερχέω (hupercheō) to overflow G:V

ὑπερχέω,

cause to overflow, τὸ ὕδωρ (accusative) [Refs 5th c.BC+]:—passive, overflow, overrun, of liquids, [Refs 4th c.BC+]; of the air, [Refs 5th c.BC+]; flow over, τρίχες τῶν ἀκρωμίδων ὑπερκεχυμέναι [Refs 4th c.AD+]