ㄆㄧㄢˊpiánㄕㄡˇshǒuzhīㄗㄨˊ

  1. 手掌腳底勞動過度皮膚摩擦產生形容辛勞他們胼手胝足開墾土地。」·葉適學士提舉府上〉:朽壤胼手胝足曝背。」篳路藍縷

with callouses on hands and feet (idiom)​, to work one's fingers to the bone