骨 ㄍㄨ ˇ gǔ 鲠 ㄍㄥ ˇ gěng 之 ㄓ zhī 臣 ㄔㄣ ˊ chén 骨 ㄍㄨ ˇ gǔ 鯁 ㄍㄥ ˇ gěng 之 ㄓ zhī 臣 ㄔㄣ ˊ chén lit. fish bone of a minister (idiom); fig. person one can rely on for candid criticism