뚫다, 파다
make (a hole) in something with a tool or by digging
지루하게 하다, 따분하게 하다
make (someone) feel tired and uninterested by being dull
지루한 사람, 지루한 것
a dull, tiresome, or uninteresting person or thing
총신, 내경
the internal diameter of a gun barrel or other tube