Lexical Definition

‎συγκαθίζω‎ synkathízō (soong-kath-id'-zo) to sit down with G:V
from ‎σύν‎ and ‎καθίζω‎

(make) sit (down) together.

Usage: 4 forms in 6 verses
Form Translated As     In Verse(s)
συνεκάθισεν He seated together Eph.2.6
sat down LXX.Gen.15.11LXX.Num.22.27
συνεκάθισε Moses sat down LXX.Exod.18.13
συγκαθισάντων when having sat down together Luke.22.55
συγκαθίσαι to sit down LXX.Jer.16.8

Abbott-Smith

περι-καθ-ίζω, [in LXX for חנה, לחם ni., etc.;]
1. to invest, besiege (Diod., IV Ki 6:24, I Mac 11:61, al.).
2. to sit around: Lk 22:55, L, txt.†

Abbott-Smith References

Book Refs
2 Kings 6:24
Luke 22:55

Liddell-Scott-Jones

συγκαθίζω-ίζω,

make to sit together or in a body, τὰ συνέδρια [LXX]:—middle or passive, sit in conclave, meet for deliberation, σ. τὸ δικαστήριον [Refs 5th c.BC+]

__II intransitive in active, sit together, [Refs 4th c.AD+]
__II.2 settle down in a boiling pot, [Refs]
__III sit or settle down, of quadrupeds that lie down by doubling their legs under them, [Refs 4th c.BC+]; σ. ἐπὶ τὰ ὄπισθεν[LXX]; σῶμα συγκεκαθικός a bent, stooping figure, [Refs 4th c.BC+]; of men, crouch down, [Refs 1st c.AD+]; of women, Thessalus in [Refs]; also τὰ νέφη εἰς τὰ κοῖλα σ. [Refs 4th c.BC+]

LSJ Scripture Refs: LXX.Exod.18.13LXX.Num.22.27