Lexical Definition

‎ἐφάλλομαι‎ ephállomai (ef-al'-lom-ahee) to jump on ^G:V
from ‎ἐπί‎ and ‎ἅλλομαι‎

leap on.

• to spring upon

Abbott-Smith

ἐφάλλομαι [in LXX for צָלַח, I Ki 10:6 11:6 16:13 * ;]
to leap upon: seq. ἐπί c. acc pers. Ac 19:16.†

Abbott-Smith References

Liddell-Scott-Jones

ἐφάλλομαι,

future - αλοῦμαι [LXX]aorist 2 ἐπᾶλτο, participle ἐπάλμενος, ἐπιάλμενος (see. below): regular aorist 2 infinitive -αλέσθαι [Refs 4th c.BC+]:—spring upon, so as to attack, with dative, Ἀστεροπαίῳ ἐπᾶλτο [Refs 8th c.BC+]; ἐπάλμενος ὀξέϊ δουρί[Refs 8th c.BC+] having leaped upon the chariot, [Refs 8th c.BC+]; of fame, ἐς Αἰθίοπας ἐπᾶλτο [Refs 5th c.BC+]; ἐπὶ τὰν χῆρα [NT+1st c.AD+]; ζῴῳ, in hostile sense, [Refs 3rd c.AD+]; εἰς τοὐπίσω ἐ., of an exercise, [LXX+2nd c.AD+]

_{LSJ Scripture Refs: LXX.1Kgs.10.6 ☩ Acts.19.16}