驢馬ろば Noun English jmdict 1 noun (common) (futsuumeishi) word usually written using kana alone donkey;ass あれは馬ではなくロバだ。 That is not a horse, but a donkey.
驢馬の橋ろばのはし Noun English jmdict 1 noun (common) (futsuumeishi) pons asinorum (hurdle to learning) Other forms ロバの橋 【ろばのはし】