Strong's #3166: 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.
Thayer's Greek Lexicon:
́
megalaucheō
1) to be grandiloquent
2) to boast great things, to bear one' s self loftily in speech or action
Part of Speech: verb
Relation: from a compound of G3173 and aucheo (to boast, akin to G837 and G2744)
Usage:
This word is used 1 times:
James 3:5: "a little member, and boasteth great things. Behold, how great a matter a little"