刻苦耐劳

kè kǔ nài láo

to bear hardships and work hard (idiom); assiduous and long-suffering

hard-working and capable of overcoming adversity

刻

kè

quarter (hour)

苦

kǔ

bitter

耐

nài

(bound form) to bear; to endure; to withstand

劳

láo

(bound form) to toil; labor