試し掘くつ坑こうMeaningsNoun1. test pit; pilot tunnelOther spellings試し掘くつ孔こうUsage share unknownKanji used試test掘dig坑pitKanji in other spellings孔small holeComposed of試し掘くつprospecting; trial diggingNoun坑こうpit (esp. of a mine)Noun