συναγωνίζομαι
Infl. fut. attic ιοῦμαι
Dep.
1. "to contend along with, to share in a contest", τινι "with" one, Thuc., etc.:—generally, ξ. τινι "to share in the fortunes of" another, id=Thuc.
2. "to help, succour", τινι Dem.
3. absol. "to fight on the same side", Thuc.