火退, 逆焼, 野火, 燹: a backburn: a controlled fire deliberately set in the path of a wildfire to create a firebreak by removing combustible material

stretch, extend

stretching, extension

tracking, capturing, arrest

capture, track on

細い: thin, narrow

接近: getting closer, approaching

接近: approach

brief, short, summarized, succinct

a whetstone: と (to), more commonly spelled using 砥 / to polish: みがく (migaku), more commonly spelled using 磨 / to flatten: たいらにする (taira ni suru), more commonly spelled using 平