馬鹿穴
ばかあな
clearance hole (hole for a bolt, screw, etc., which is large enough to allow the thread, etc. to pass through)
馬穴 is read as ばけつ (baketsu) and means bucket.
ばけつ
baketsu
ばかあな
clearance hole (hole for a bolt, screw, etc., which is large enough to allow the thread, etc. to pass through)