逞 (w)

(chěng) to show off; to flaunt; to carry out or succeed in a scheme; to indulge; to give free rein to

逞其口舌 (w)

(chěngqíkǒushé) to boast of one’s quarrels to others (idiom)

逞能 (w)

(chěngnéng) to show off one's ability; to boast one's merits