锲 ㄑㄧㄝ ˋ qiè 而 ㄦ ˊ ér 不 ㄅㄨ ˋ bù 舍 ㄕㄜ ˇ shě 鍥 ㄑㄧㄝ ˋ qiè 而 ㄦ ˊ ér 不 ㄅㄨ ˋ bù 捨 ㄕㄜ ˇ shě to chip away at a task and not abandon it (idiom); to chisel away at sth to persevere unflagging efforts