海 (hǎi): Sea or ocean.
底 (dǐ): Bottom, base, or floor.
捞 (lāo): To scoop up from a liquid, to fish out, to dredge.
月 (yuè): The Moon.
When combined, these characters create a literal and vivid image: “to scoop the moon from the sea bottom.” The imagery itself immediately communicates the impossibility and foolishness of the act, making it a powerful and memorable idiom.
The idiom originates from a classic Buddhist parable. A group of monkeys saw the moon's reflection in a well and, thinking it had fallen in, became frantic to save it. They formed a long chain by holding each other's tails to reach down into the water. Just as the first monkey was about to “scoop” the moon, the branch they were hanging from broke, and they all fell in. The wise old monkey, however, simply pointed up to the sky, showing them the real moon was safe and sound all along.
This story embeds “海底捞月” with a deeper meaning than just “impossible task.” It's a caution against mistaking illusion for reality and acting on ignorance. It highlights the importance of clear perception and wisdom before taking action.
Comparison to a Western Concept: This is very similar to the English phrase “a wild goose chase.” Both describe a futile pursuit. However, “海底捞月” carries a more philosophical weight due to its origin story. It emphasizes the foolishness of chasing a reflection or an illusion, whereas “a wild goose chase” focuses more on the pointless, meandering nature of the pursuit itself. “海底捞月” is about the goal being an illusion; “a wild goose chase” is about the path being fruitless.
“海底捞月” is used in a variety of modern contexts, almost always with a negative or critical connotation, to describe a wasted effort.
In Business and Work: You might hear it used to describe a business plan with no chance of success. For example, “Trying to compete with that giant corporation on price alone is just 海底捞月.”
In Personal Relationships: It can describe trying to achieve an impossible relational goal, like trying to win back an ex-partner who has made it very clear they have moved on.
The “Haidilao” Hot Pot Connection: This is a crucial modern association. The famous hot pot chain 海底捞 (Hǎi Dǐ Lāo) is a clever play on words. In Mahjong, the term “海底捞月” refers to winning with the very last tile drawn from the wall—an unlikely and very lucky win. So, the restaurant name cleverly suggests both “scooping delicious things from the pot (the 'sea')” and “a stroke of incredible luck.” This modern usage has made the phrase extremely well-known, even among people who might not use the idiom in its original, negative sense.