切きり羽は

noun

face; working face

Mining term for the exposed surface of a mine or tunnel where excavation is actively taking place.

• 坑こう夫ふたちは切きり羽はで石せき炭たんを掘ほり進すすめた。

  The miners dug coal at the working face.

• 切きり羽はの状じょう態たいを確かく認にんしてから作さ業ぎょうを始はじめる。

  We check the condition of the face before starting work.