συγκαθίζωsynkathízō

to give (or take) a seat in company with

Greek (New Testament) · G4776

Meanings

1. to invest, besiege (Diod., 2 Kings 6:24, 1 Maccabees 11:61, and elsewhere).

2. to sit around: Luke 22:55, L, text

Same root

σύνsýn · G4862with or together (but much closer than G3326 (μετά) or G3844 (παρά)), i.e. by association, companionship, process, resemblance, possession, instrumentality, addition, etc.
καθίζωkathízō · G2523to seat down, i.e. set (figuratively, appoint); intransitively, to sit (down); figuratively, to settle (hover, dwell)

Where it appears

Appears 2 times in the Bible.

Luke 22:55 The guards lit a fire in the middle of the courtyard and sat around it, and Peter joined them there.
Ephesians 2:6 For he raised us from the dead along with Christ and seated us with him in the heavenly realms because we are united with Christ Jesus.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.