掘くっ進しん

noun, noun or participle which takes 'suru', intransitive verb

tunnelling; excavation; drilling; boring

Technical term used in civil engineering and mining for advancing a tunnel or borehole. Often used with する to mean 'to tunnel through' or 'to drill'.

• トンネルを掘くっ進しんする工こう事じが始はじまった。

  The work to tunnel through the mountain has begun.

• この機き械かいは硬かたい岩がん盤ばんを掘くっ進しんできる。

  This machine can drill through hard bedrock.