Strong’s Greek
G3166 — megalaucheo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
αὐχέω
megalaucheo — pronounced 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):--boast great things. see GREEK for 3173 see GREEK for 837 see GREEK for 2744
1 occurrence in the KJV.
James 3:5
Even so the tongue is a little member, and boasteth great things. Behold, how great a matter a little fire kindleth!