Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
συμπροπέμψαι to escort LXX.Gen.12.20
συμπροπέμπων escorting LXX.Gen.18.16

Liddell-Scott-Jones

συμπροπέμπω (sumpropempō) to escort G:V

συμπροπέμπω-πέμπω,

join in escorting, τινα [Refs 5th c.BC+]; τὸ σῶμά τινος, in funeral procession, [Refs 1st c.BC+]