Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
ενέκειτο for he clung LXX.Gen.34.19
έγκειται clings LXX.Gen.8.21

Liddell-Scott-Jones

ἔγκειμαι (egkeimai) to cling G:V

ἔγκειμαι,

future -κείσομαι: used as passive of ἐντίθημι:

__I lie in, be wrapped in, ἐπεὶ οὐκ ἐγκείσεαι αὐτοῖς [τοῖς εἵμασι] [Refs 8th c.BC+]; simply, to be in, ὀφθαλμὸς ἕεις ἐνέκειτο μετώπῳ [Refs 8th c.BC+]: in mal.participle, [Refs 3rd c.BC+]
__I.2 ἐγκεῖσθαί τινι to be involved in, πόθῳ [ἔγκειμαι">Refs 7th c.BC+] I have cares laid on me, [Refs 3rd c.BC+]
__I.2.b to be implied, involved in, . τὸ αἰσθητικὸν εἶναι ἐν τῷ εἴδει [Refs 3rd c.AD+]
__I.3 absolutely, to be inserted, [Refs 5th c.BC+]
__II press hard, especially of troops pressing upon a defeated or retreating enemy, [Refs 5th c.BC+]; of opponents in politics or argument, ἐνέκειντο τῷ Περικλεῖ [Refs] adjective or adverb, πολλὸς ἐνέκειτο λέγων was very urgent, [Refs 5th c.BC+]; πολὺς τοῖς συμβεβηκόσι ἔγκειται he insists much upon.., [Refs 4th c.BC+]; ἄγαν . τινί to be vehement against one, [Refs 5th c.BC+]; ἰσχυρῶς . [Refs 5th c.BC+]; ὅλος ἐγκεῖσθαί τινι to be devoted to one, [LXX+3rd c.BC+]
__III to be upon, δέ οἱ περὶ ποσσὶ.. ἐνέκειτο, of a sandal, [Refs]
__IV to be a burden, annoyance, [Refs 3rd c.BC+]

LSJ Scripture Refs: LXX.Gen.8.21