意馬心猿[ibashinen] (being unable to control) one's worldly desires and passions
猿轡をかます[sarugutsuwawokamasu] to gag someone
猿も木から落ちる[sarumokikaraochiru] even monkeys fall from trees
猿回し[sarumawashi] showman who trains performing monkeys
猿ぐつわ[sarugutsuwa] (mouth) gag

猿股[sarumata] undershorts
猿芝居[sarushibai] monkey show
猿まね[sarumane] indiscriminate imitation (lit: monkey imitator)
猿人[enjin] ape man

猿轡をかます[sarugutsuwawokamasu] to gag someone
猿轡[sarugutsuwa] (mouth) gag
金轡[kanagutsuwa] a (metal) bit

轡虫[kutsuwamushi] Mecopoda nipponensis (species of katydid)
轡銜[kutsuwa] bit (i.e. attached to a bridle)
轡屋[kutsuwaya] brothel