Strong's G2620 — κατακαυχάομαι (verb)
katakauchaomai (kat-ak-au-khah'-om-ai) v.
1. to exult against (i.e. over)
[from G2596 and G2744]
KJV: boast (against), glory, rejoice against 
Root(s): G2596, G2744 
Hebrew root: καυχάομαι
Occurrences: 4