noun · an upright and outspoken person who is not afraid to offer blunt criticism

他是一个正直的骨鲠之臣，敢于当面指出领导的错误。

a fish bone or a bone stuck in the throat

他吃鱼时不小心，喉咙里卡了骨鲠。

something that one feels compelled to speak out about or that weighs on one's mind

这件事如果不说出来，我总觉得如骨鲠在喉，寝食难安。