ㄗㄨㄛˋzuòㄎㄨㄥkōng

  1. 開通漢書··張騫》:於是西北鑿空使往者博望侯。」文選··》:鑿空萬里。」

  2. 憑空穿鑿新唐書··刑法》:深刻鑿空。」朱子語類·一一·讀書》:不可鑿空立論讀書所見不容不立。」

to open an aperture, (extended meaning)​ to cut a way through, to open up a road