Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
συνδειπνούσι dining LXX.Gen.43.32
συνδείπνει dine with LXX.Prov.23.6

Liddell-Scott-Jones

συνδειπνέω (sundeipneō) to dine with G:V

συνδειπνέω-έω,

dine or sup with, συνδειπνέωέω τῷ λῶντι [Refs 5th c.BC+]: absolutely, dine or sup with others or together, [Refs 5th c.BC+]; οἱ συνδειπνέωοῦντες the members of a picnic party, [Refs 5th c.BC+]