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) n Advanced ➥
虎穴に入らずんば虎子を得ず こけつにいらずんばこじをえず こけつにいらずんばこしをえず nothing ventured, nothing gained; you will not get the tiger cub without entering the tiger's den exp proverb Advanced ➥