Lexical Definition

‎μεγαλαυχέω‎ megalauchéō (meg-al-ow-kheh'-o) to boast ^G:V
from a compound of ‎μέγας‎ and (to boast

boast great things.

• akin to ‎αὐξάνω‎ and ‎καυχάομαι‎)
• to talk big, i.e. be grandiloquent (arrogant, egotistic)

Abbott-Smith

μεγαλ-αυχέω, -ῶ (= μεγάλα αὐχέω), [in LXX: Ez 16:50 (גּבהּ), al.;]
to boast great things: Ja 3:5 (Rec. for μεγάλα αὐχεῖ, WH).†

Abbott-Smith References

Liddell-Scott-Jones

combination of: αὐχέω (μέγας+αὐχέω)

μεγαλαυχέω-αυχέω,

boast, brag, [LXX+4th c.BC+]:—also in middle, [Refs 5th c.BC+]

__II c.accusative, boast of, μονομάχιον [Refs]

_{LSJ Scripture Refs: LXX.Ezek.16.50}