Strong's G3166 — μεγαλαυχέω (verb)
megalaucheo (meg-al-au-kheh'-o) v.
1. to talk big, i.e. be grandiloquent (arrogant, egotistic)
[from a compound of G3173 and aucheo "to boast" (akin to G837 and G2744)]
KJV: boast great things 
Root(s): G3173 
See also: G837, G2744 
Hebrew root: μέγας
Occurrences: 1