boast, be proud, pride, triumphantly
誇 centers on expressing strong positive self-assessment: boasting, being proud, or acting with pride. The idea of triumphantly reflects the outward display of that pride.
誇 combines 言 (words) with 夸, which likely contributes both sound and the idea of exaggeration or largeness. Together they suggest speaking in an exaggerated, boastful way.
Words 言 that are big and exaggerated 夸: someone speaking with pride, boasting about their achievements.
For コ, imagine a proud person boasting about their 'co'-llection of trophies: co -> コ, and their words are full of pride.
to boast of; to be proud of; to take pride in
pride; boast; credit (to)
proud; haughty; arrogant
exaggeration
flaunting; showing off; display (of power, wealth, etc.); ostentation
proud; triumphant; boastful
exaggeration; hyperbole
to be in full bloom; to blossom in full glory; to be in fullness of bloom
megalomania; delusions of grandeur
world-class; (of) high global reputation
to triumph; to be elated with success
to be of excellent workmanship
courtship display
proud
to take pride in; to pride oneself; to be proud of
triumphant look
proud; lordly
proud
megalomania
exaggerated advertisement; overblown advertising; hype