Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
ενεχείρησεν took in hand LXX.Jer.51.12
ενεχείρησαν they took in hand LXX.Jer.18.22
ενεχείρησέ took in hand LXX.Jer.49.16

Liddell-Scott-Jones

ἐγχειρέω (egcheireō) to take in hand G:V

ἐγχειρέω-έω,

[Refs 4th c.AD+] ἰγχηρέω [Refs 4th c.BC+]: (χείρ):— take a thing in hand, undertake, attempt, with dative of things, [Refs 5th c.BC+]: with infinitive, [ἐγχειρέωήσαντα συκοφαντεῖν 4th c.BC: Hyperides Orator “pro Euxenippo” 34 ">Refs 5th c.BC+]: absolutely, to make an attempt or beginning, [Refs 5th c.BC+]

__2 lay hands on, attack, πόλεσι [Refs 5th c.BC+]
__3 put hand to a case requiring medical treatment, τινί [Refs 5th c.BC+]
__4 try one's hand in argument, εἰς ἑκάτερον [Refs 1st c.AD+]:— passive, to be discussed, [Refs]
__II in late Poets, take in hand, with accusative, ἔργον [Refs] —ἐπιχειρέω is more common in _Attic dialect_