Quick Definition
I struggle in company with
Strong's Definition
to struggle in company with, i.e. (figuratively) to be a partner (assistant)
Derivation: from G4862 (σύν) and G75 (ἀγωνίζομαι);
KJV Usage: strive together with
Thayer's Greek Lexicon
συναγωνίζομαι: 1 aorist middle infinitive συναγωνίσασθαί; from Thucydides and Xenophon down; to strive together with one, to help one in striving: τίνι ἐν τάς προσευχαῖς, in prayers, i. e. to offer intense prayers with one, Rom_15:30; in what sense intense prayer may be likened to a struggle, see Philippi at the passage ((cf. ἀγωνιζόμενος in Col_4:12 and Lightfoot's note)).
Mounce Concise Greek Dictionary
συναγωνίζομαι synagōnizomai 1x
to combat in company with any one; to exert one s strength with, to be earnest in aiding, help, Rom_15:30
Abbott-Smith Greek Lexicon
* συν -αγωνίζομαι ,
to strive together with, to help ( prop ., of sharing in a contest): c. dat. pers . et rei , Rom_15:30 .†
Moulton & Milligan — Vocabulary of the Greek NT
συναγωνίζομαι [page 601]
strive together with ( Rom_15:30 ) : Syll 193 (= .3 367) .18 (B.C. 290 289) συναγωνιζό [μενος τῆι τοῦ δήμ ]ου σωτηρίαι , ib . 286 (= .3 606) .7 (B.C. 190) συναγωνισάμενο τὴν ἐν Λυδίαι . . μάχην , and OGIS 280 .3 ( c . B.C. 228) οἱ συναγωνισάμενοι τὰς πρὸς τοὺς Γ [αλ ]άτας καὶ Ἀντίοχον μάχας χαρισ [τ ]ήρια . For the subst. see P Oxy XIV. 1676 .36 (iii/A.D.) Δι ]ονύσιος ὁ συναγωνισ [τής μο ]υ , Dionysius my fellow-worker, and BGU IV. 1074 .1 (A.D. 275) τοῖς τούτων συναγωνισταῖς χαίρειν .
Liddell-Scott — Intermediate Greek Lexicon
συναγωνίζομαι fut. attic ιοῦμαι Dep. "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. "to help, succour", τινι Dem. absol. "to fight on the same side", Thuc.
STEPBible — Tyndale Abridged Greek Lexicon
συν-αγωνίζομαι
to strive together with, to help (prop., of sharing in a contest): with dative of person(s) and of thing(s), Rom.15:30.†
(AS)