Lexical Definition

‎συμβάλλω‎ symbállō (soom-bal'-lo) to ponder/confer ^G:V
from ‎σύν‎ and ‎βάλλω‎

confer, encounter, help, make, meet with, ponder.

• to combine, i.e. (in speaking) to converse, consult, dispute, (mentally) to consider, (by implication) to aid, (personally) to join, attack

Abbott-Smith

συν-βάλλω (Rec. συμ-), [in LXX: II Ch 25:19 (גּרה hith.), Is 46:6 (זוּל), Je 50 (43):3* (סוּת hi.), Wi 5:8, al. ;]
to throw together, hence,
(a) of speech (seq. λόγους, Eur., al.), to discuss, confer (sc. λόγους): c. dat. pers., Lk 11:53, WH, mg., Ac 17:18; seq. πρὸς ἀλλήλους, Ac 4:15;
(b) to reflect, consider, ponder: ἐν τ. καρδίᾳ, Lk 2:19;
(c) to meet with, fall in with: Ac 20:14; in hostile sense, εἰς πόλεμον, c. dat. (εἰς μάχην, Polyb.), Lk 14:31;
(d) mid., to contribute (Polyb., al.; cf. MM, xxiv): Ac 18:27.†

Abbott-Smith References

Liddell-Scott-Jones

συμβάλλω,

future -βᾰλῶ: aorist -έβᾰλον, infinitive -βᾰλεῖν: perfect -βέβληκα: aorist 1 passive -εβλήθην:—of these tenses [Refs 8th c.BC+]present active, aorist active and middle, but most commonly Epic dialect intransitive aorist forms συμβλήτην, -βλήμεναι, middle σύμβλητο, -βληντο, -βλήμενος, subjunctive 2nd pers. singular -βλήεαι probably conjecture for -βλήσεαι in [Refs 8th c.BC+], 3rd.pers. singular contraction -βληται[Refs 8th c.BC+]:—throw together, dash together, σύν ῥ᾽ ἔβαλον ῥινούς, of men in close combat, [Refs 8th c.BC+]; bring together, unite, e.g. of rivers that fall into one another, ἐς μισγάγκειαν συμβάλλετον ὄβριμον ὕδωρ [Refs 8th c.BC+]:— middle, πολλοὶ ποταμοὶ σ. τὸ σφέτερον ὕδωρ [Refs 5th c.BC+]; ὁ Ἀκεσίνης τῷ Ἰνδῷ τὸ ὕδωρ σ. [Refs 2nd c.AD+]; σ. τὰ ὦτα πρὸς τὴν γῆν have their ears reaching to.., [Refs 4th c.BC+] —passive, κατὰ τὰς ῥᾶγας συμβεβλημένων [τῶν δακτύλων] [Refs 2nd c.AD+]

__2 collect, [Refs 5th c.BC+]; store up, accumulate, κριθὰς ἵπποις συμβεβλημένας πολλάς [Refs]
__3 jumble up together, διαφέροντα σ. εἰς ταὐτόν [Refs 5th c.BC+]
__4 intransitive in active, fit [Refs 4th c.BC+]; to be suitable, τὰ χεδροπὰ σ. εἰς τὰς νέας [Refs 4th c.BC+] (unless = sow, set).
__4.b to be profitable, σ. τῷ πολιτικῷ.. δικαίῳ εἶναι [Refs 5th c.BC+]
__5 intransitive, come together, ἔνθα δίστομοι.. σ. ὁδοί where two roads join, [Refs 5th c.BC+]; τὰ συμβάλλοντα the watersmeet, [Refs 3rd c.BC+]; [φλὲψ] σ. τῇ ἀποσχίσει [Refs 4th c.BC+]; collide, τοὺς τύπους ἀνάγκη συμβάλλειν ἑαυτοῖς [Refs 4th c.BC+]: Geometry texts, meet, τὸ σημεῖον, καθ᾽ ὃ συμβάλλουσιν the point in which (the straight lines) meet, [Refs 3rd c.BC+]
__6 βλέφαρα σ. ὕπνῳ close the eyes in sleep, [Refs 4th c.BC+]; how shall I meet her eyes with mine? [Refs 5th c.BC+]
__7 generally, join, unite, σ. σχοινία twist ropes (compare συμβολεύς), [Refs 5th c.BC+]; ὠμόλινον σ. πεντάπλουν [Refs 5th c.BC+]; fit together, ἁρμούς [Refs 4th c.BC+]; κεραῖαι συμβεβλημέναι [Refs 3rd c.BC+]; δεξιὰς σ. ἀλλήλοισι join hands, [Refs 5th c.BC+]
__8 σ. συμβόλαιά τινι or πρός τινα make a contract with a person, especially lend him money on bond, [Refs 5th c.BC+]; συμβόλαιον εἰς τἀνδράποδα συμβεβλημένον money lent on the security of the slaves, [Refs 4th c.BC+]: absolutely, in same sense, [Refs 5th c.BC+]; make a contract, [Refs 5th c.BC+]; of a marriage contract, Mitteis [Refs 2nd c.AD+]; advance, lend, πέρα μεδίμνου κριθῶν [Refs 4th c.BC+]; ἱμάτια, χρυσία, etc., [Refs 5th c.BC+]; ἐπί τισι on certain terms, [Refs 5th c.BC+]; ὁ συμβαλών the lender, creditor, [Refs 4th c.BC+]. the borrowers, debtors, [Refs]:— middle, with perfect passive, pay a share, contribute, ὁλκάδα οἱ συμβαλέεσθαι give him a merchant-vessel, [Refs 5th c.BC+]; σ. χρήματά τινι εἰς τροφὴν τῶν στρατιωτῶν advance it, [Refs 4th c.BC+]; τριήρεις εἰς κίνδυνον [Refs 5th c.BC+]
__9 generally, contribute:— passive, συμβάλλεταί τις.. μερίς [Refs 2nd c.AD+] —in this sense mostly in middle, τέμενος συμβάλλεσθαι add thereto, [Refs 5th c.BC+]; τὸ μὴ ἀγανακτεῖν.. ἄλλα τέ μοι πολλὰ συμβάλλεται, καὶ.. many circumstances contribute to my feeling no vexation, and especially.., [Refs 5th c.BC+]; τιμὴν καὶ δόξαν τῇ πόλει σ. [Refs 5th c.BC+]; frequently with μέρος as object, ἔργων οὐκ ἐλάχιστον μέρος σ. [Refs 5th c.BC+]; τὴν μεγίστην εἰς αὐτὰ μοῖραν [Refs 5th c.BC+] contributes to its volume, [Refs 5th c.BC+]; συμβαλλόμενα contributory causes, [Refs 4th c.BC+]: absolutely, to be helpful, πολλά ἐστι τὰ συμβαλλόμενα τοῖς βουλομένοις [Refs 5th c.BC+]; φόνου κηκὶς ξ. contributes to the proof, [Refs 4th c.BC+] many things contribute [their share] of this fear, i.e. join in causing it, [Refs 5th c.BC+]
__10 συμβάλλεσθαι γνώμας contribute one's opinion to a discussion, [Refs 5th c.BC+]; λόγον σ. περὶ βίου contribute an opinion about life, [Refs 5th c.BC+]; also συμβαλέσθαι τι to have something to say, [Refs]; ταῦτά σοι περὶ Ἔρωτος σ. [Refs]; συμβαλοῦ γνώμην contribute your opinion, help in judging, [Refs 5th c.BC+]; σ. τὴν γνώμην τῆς βουλῆς, with or without εἰς τὸν δῆμον, communicate it, [Refs]; cast votes, [Refs 5th c.BC+]
__II συμβάλλειν (i.e. λόγους) converse, σ. τινί or πρός τινα, [NT+1st c.AD+]middle, ἀτὰρ τί ἐγὼ περὶ κλοπῆς σ.; [Refs 5th c.BC+]
__II bring men together in hostile sense, pit them against each other, match them, ἀμφοτέρους θεοὶ σύμβαλον [Refs 8th c.BC+]; σ. σκύμνον λέοντος σκύλακι κυνός set one to fight with the other, [Refs 5th c.BC+]; ἄνδρα ἀνδρὶ καὶ ἵππον ἵππῳ σ. [Refs 5th c.BC+]; ἀλεκτρυόνας σ. [Refs 4th c.BC+] make him contend with.., [Refs 5th c.BC+]
__II.b middle, join in fight, σὺν δ᾽ ἐβάλοντο μάχεσθαι ἐναντίον [Refs 8th c.BC+]
__II.c intransitive, come together, σύμβαλον μάχεσθαι [Refs]; also ς. alone, come to blows, engage, πρίν γ᾽ ἠὲ ξυμβλήμεναι ἠὲ δαμῆναι [Refs 5th c.BC+]; Ἄρης Ἄρει δυμβαλεῖ, Δίκα Δίκᾳ [Refs 4th c.BC+]; Ἕλληνες Μήδοις σ. [Refs 5th c.BC+]; συμβάλλων coming into collision, [Refs 5th c.BC+]
__II.2 σ. πόλεμον καὶ δηϊοτῆτα engage in war, [Refs 8th c.BC+]; so in Trag., σ. βάκχαις μάχην [Refs 5th c.BC+] bandy reproaches, [Refs 5th c.BC+]
__II.3 middle, fall in with one, meet him, with dative, frequently in [Refs 8th c.BC+]aorist forms beginning ξυμβλη- or συμβλη- solely in this sense, Νέστορι δὲ ξύμβληντο [Refs 8th c.BC+]; ὅτε κεν συμβλήσεαι (to be read -βλήεαι) αὐτῷ [Refs 8th c.BC+]
__II.4 so in active, συμβαλών having met, [Refs 4th c.BC+]; οἱ συμβάλλοντες those who come in contact with one, [Refs 1st c.AD+]; φιλοσόφῳ σ. [Refs 2nd c.AD+]
__III compare, σμικρὰ μεγάλοισι [Refs 5th c.BC+]:—passive, [Refs 5th c.BC+]; τὸ ἀργύριον τὸ Βαβυλώνιον πρὸς τὸ Εὐβοικὸν συμβαλλόμενον τάλαντον the Babyl. talent being compared with, reduced to, the Euboic, [Refs]
__III.b compare for the purpose of checking, μέτρῳ συμβεβλημένῳ πρὸς τὸ χαλκοῦν Wilcken [Refs 3rd c.BC+]
__III.2 middle, reckon, compute, [Refs 5th c.BC+]:—passive, ἡ ὁδὸς ἡ ἡμερησίη ἀνὰ διηκόσια στάδια συμβέβληταί μοι [Refs]
__III.3 conclude, infer, conjecture, interpret, συμβαλεῖν τι [Refs 5th c.BC+]; σ. ὅτι.. [Refs 5th c.BC+]; τοῦτο σ. [Refs 5th c.BC+]; τοῦτο σ., ὅτι.. [Refs 5th c.BC+]; τὰ πρὶν οὐκ εὔγνωστα σ. [Refs 5th c.BC+]:—middle, absolutely, [Refs 5th c.BC+]: with accusative, make out, understand, τὸ πρῆγμα[Refs]infinitive, [Refs]
__IV agree, arrange, καθάπερ ξυνέβαλον ἢ διέθεντο [Refs 5th c.BC+]:—middle, make a treaty, Foed. cited in [Refs 5th c.BC+]; agree upon, fix, settle, λόφον εἰς ὃν δέοι ἁλίζεσθαι [Refs 5th c.BC+]

_{LSJ Scripture Refs: Acts.4.15}