Quick Definition
μεγαλαυχέω v. I boast, am arrogant, vaunt
Strong's Definition
from a compound of 3173 and aucheo (to boast; akin to 837 and 2744); to talk big, i.e. be grandiloquent (arrogant, egotistic)
KJV Usage: boast great things
UBS Dictionary of the Greek New Testament
verb
33.368 · Communication · Boast
to boast to express an unusually high degree of confidence in someone or something being exceptionally noteworthy Whether in any particular context the boasting is legitimate or not depends upon what is boasted about. In a number of languages, however, quite different terms are employed, depending upon the differing degrees of justification for such boasting.
1 There are undoubtedly certain connotative differences in these terms for boasting, but this cannot be determined from existing contexts.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
μεγαλ-αυχέω, -@ ; (μεγάλαυχος, and this fr. μεγάλα and avxéw); to be grandiloquent; to boast great things, to bear one’s self loftily in speech or action: ἡ γλῶσσα peyadavyxet (LT Tr WH μεγάλα αὐχεῖ), Jas. 111. 5, where it seems to denote any kind of haughty language which wounds and provokes others, and stirs up strife. (Aeschyl. Ag. 1528; Polyb. 12, 13, 10; 8, 23,11; Diod. 15, 16, al.; mid. γυναῖκα πρὸς θεοὺς ἐρίζουσαν καὶ peyadavxouperny, Plat. rep. 3 p. 395 d.; for 723, to exalt one’s self, carry one’s self haughtily, Ezek. xvi. 50; Zeph. iii. 11; add, 2 Mace. xv. 32; Sir. xlviii. 18.)
Abbott-Smith Greek Lexicon
μεγαλ-αυχέω, -ῶ (= μεγάλα αὐχέω),
[in LXX: Ez 16:50 (גּבהּ), al.;]
to boast great things: Ja 3:5 (Rec. for μεγάλα αὐχεῖ, WH).†
Moulton & Milligan — Vocabulary of the Greek NT
αὐχέω. For αὐχέω construed with an acc. in Jas 35 Hort aa ἢ compares <Aristid. i. 103 μόνοις δ᾽ ὑμῖν ὑπάρχει καθαρὰν εὐγένειάν τε καὶ πολιτείαν αὐχῆσαι, and translates ‘‘ hath great things whereof to boast,’’ or shortly ‘‘ great are its boasts ’’ (ἡ. δ. the concrete subjects for boasting, adxqpara, not the boastings, αὐχήσεις). Vettius has the verb with ἐπί τινι, Ρ. 241° ὅτε οἱ πρὸ ἡμῶν ἐπὶ τούτῳ ηὔχουν Kal ἐμακαρίfovro. It has ἃ personalaccus, in A’aibe/ 567° (ii/a.D.) αὐχῶ σώφρονα... Σεβήραν and similarly 2. 8225 (ii/iii a.p.) Kexpor(ny αὐχεῖ πόλιν (cf. 9327—iii/A.pD.): in the passive, 26. 192'(Rom, age, Thera) οὐ μόνον [η]ὐχούμην Λακεδαίμονος ἐκ βασιλήων. A Theban epitaph (iv/A.D.), 25. 4891, has the very phrase of Jas 3°, ὃν μεγάλ᾽ αὐϊχήσασα πατρὶς Θή[β]η mot’ érw[ ..: Kaibel reads ἐβώλπει, remarking that diand 30 ἑαυτοῦ outnumbers αὑτοῦ in Attica by 100: 7. But ; gamma survived long in Boeotia (but surely not into iv/a.D.,
Liddell-Scott-Jones — Greek-English Lexicon
μεγαλαυχέω (megalaucheō) — to boast. μεγᾰλ-αυχέω, boast, brag, [LXX+4th c.BC+]:—also in middle, [Refs 5th c.BC+]
II. c.accusative, boast of, μονομάχιον [Refs]