さるも木からおちる
Even monkeys fall from trees (nobody’s perfect)
ごうに入ってはごうにしたか
When you enter a village, obey the village (When in Rome, do as the Romans do)
鬼のいぬまにせんたく
To do the laundry while the ogre is out (when the cat’s away, the mice will play)
のうあるたかはつめをかくす
The clever hawk hides its talons (he who knows most speaks least)