骨鲠在喉

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

骨

gǔ

bone

鲠

gěng

to choke on a piece of food

在

zài

to exist; to be alive

喉

hóu

throat