磨ㄇㄛˊmó穿ㄔㄨㄢchuān鐵ㄊㄧㄝˇtiě硯ㄧㄢˋyàn

  1. 比喻用功讀書，持久不懈。參見「鐵硯磨穿」條。元·范康《竹葉舟·第一折》：「坐破寒氈，磨穿鐵硯。」

英to grind one's way through an ink stone, to persevere in a difficult task (idiom)​, to study diligently (idiom)​