Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
συνεξεπορεύοντο went forth together LXX.Judg.11.3
συνεκπορεύεσθαι to go forth with LXX.Judg.13.25

Liddell-Scott-Jones

συνεκπορεύομαι (sunekporeuomai) to go forth together G:V

συνεκπορεύομαι-πορεύομαι,

passive, go forth together with, τινι [LXX+2nd c.BC+]

LSJ Scripture Refs: LXX.Judg.13.25