鲤鱼跳龙门

lǐ yú tiào lóng mén

to make a significant advance in one's career (idiom)

to get one's big break

鲤

lǐ

carp

鱼

yú

fish (CL:條|条[tiao2],尾[wei3])

跳

tiào

to jump

龙

lóng

(fig.) emperor

门

mén

gate