鋒芒

tip (of pencil, spear etc) / sharp point / cutting edge / spearhead / vanguard

point of a spear / edge of a tool / vanguard / forward (in sports team)

awn (of cereals) / arista (of grain) / tip (of a blade) / Miscanthus sinensis (type of grass) / variant of 邙, Mt Mang at Luoyang in Henan

to show off one's ability

first sign of budding talent / to display one's ability for the first time

to draw in one's claws / to show some modesty

to be talented yet self-effacing (idiom)