brunt; sharp edge of an argument; cutting remark
Rare literary term, originally from Zen Buddhism referring to the sharp point of a master's words that cuts through delusion. In modern contexts, it can mean the brunt or sharp edge of a verbal attack or argument.
Faced with his sharp, cutting words, the opponent could say nothing.
禅問答では、師の機鋒が弟子の迷いを断ち切る。
In Zen dialogue, the master's sharp retort cuts through the disciple's delusion.