Strong's G4866 — συναθλέω (verb)
sunathleo (soon-ath-leh'-o) v.
1. to wrestle in company with
2. (figuratively) to seek jointly
[from G4862 and G118]
KJV: labour with, strive together for 
Root(s): G4862, G118 
Hebrew root: ἀθλέω
Occurrences: 2