ㄆㄧㄒㄧˋㄉㄠˇdǎoㄎㄨㄢˇkuǎn

  1. 沿空隙指骨批郤導窾比喻凡事要領可以迎刃而解莊子·養生》:固然。」··〉:批郤導窾迎刃而解棋局一著。」

to get right to the heart of the matter (idiom)​