Setbacks in Chinese / Japanese...

百折不撓 is a Chinese proverb that means “Be undaunted in the face of repeated setbacks.”

More directly translated, it reads, “[Overcome] a hundred setbacks, without flinching.” 百折不撓 is of Chinese origin but is commonly used in Japanese and somewhat in Korean (same characters, different pronunciation).

This proverb comes from a long, and occasionally tragic story of a man that lived sometime around 25-220 AD. His name was Qiao Xuan, and he never stooped to flattery but remained an upright person at all times. He fought to expose the corruption of higher-level government officials at great risk to himself.

Then when he was at a higher level in the Imperial Court, bandits were regularly capturing hostages and demanding ransoms. But when his own son was captured, he was so focused on his duty to the Emperor and the common good that he sent a platoon of soldiers to raid the bandits' hideout, and stop them once and for all even at the risk of his own son's life. While all of the bandits were arrested in the raid, they killed Qiao Xuan's son at first sight of the raiding soldiers.

Near the end of his career, a new Emperor came to power, and Qiao Xuan reported to him that one of his ministers was bullying the people and extorting money from them. The new Emperor refused to listen to Qiao Xuan and even promoted the corrupt Minister. Qiao Xuan was so disgusted that in protest, he resigned from his post as minister (something almost never done) and left for his home village.

His tombstone reads “Bai Zhe Bu Nao” which is now a proverb used in Chinese culture to describe a person of strong will who puts up stubborn resistance against great odds.

My Chinese-English dictionary defines these 4 characters as “keep on fighting despite all setbacks,” “be undaunted by repeated setbacks,” and “be indomitable.”

Our translator says it can mean “never give up” in modern Chinese.

Although the first two characters are translated correctly as “repeated setbacks,” the literal meaning is “100 setbacks” or “a rope that breaks 100 times.” The last two characters can mean “do not yield” or “do not give up.”
Most Chinese, Japanese, and Korean people will not take this absolutely literal meaning but will instead understand it as the title suggests above. If you want a single big word definition, it would be indefatigability, indomitableness, persistence, or unyielding.

See Also:  Tenacity | Fortitude | Strength | Perseverance | Persistence

被雨淋過的人不怕露水 is a Chinese proverb that literally translates as “One who has been drenched by the rain is not afraid of dew drops.”

Figuratively, this means:
One who has gone through hardships is not afraid of (minor)setbacks.

吃一塹長一智 is a Chinese proverb that means “Fall into a moat, and you will gain wisdom from the experience.”

It really suggests that the failures, troubles, frustrations, and setbacks that you encounter in your life are actually helping you to find wisdom. Some would also translate this proverb as “Learn from your mistakes” or “Learn from your experience.”

If you are studying Chinese, you will recognize the first character as “eat,” but in this case, it means to “experience” (as used in this proverb, it is suggesting that you have fallen into a moat and/or had a hard time crossing it).
Translated character by character, this whole proverb is, “Experience one moat, gain one wisdom/knowledge.”

Note: This can be pronounced in Korean, but it's not a commonly used phrase.