Strong's G3166 · Greek

αὐχέω

megalaucheo · meg-al-ow-kheh'-o

from a compound of 3173 and aucheo (to boast; akin to 837 and 2744); to talk big, i.e. be grandiloquent (arrogant, egotistic)

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

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

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain