gǔ gěng
fish bone
bone stuck in the throat
sth one feels obliged to speak out about
candid speaker
gǔ gěng zài hóu
fish bone stuck in one's throat (idiom); fig. to feel obliged to speak out candidly
sth on one's mind
gǔ gěng zhī chén
lit. fish bone of a minister (idiom); fig. person one can rely on for candid criticism