The characters combine literally to mean “Gazing at plums (wàng méi) to stop thirst (zhǐ kě).” The idea is that the mere thought of sour plums makes your mouth water, providing a temporary physiological sensation that tricks your brain into feeling less thirsty.
The origin of `望梅止渴` comes from the classic Chinese text “A New Account of the Tales of the World” (世说新语). The story features Cao Cao (曹操), a brilliant but cunning warlord from the Three Kingdoms period (220-280 AD). During a military campaign, his army was marching through an arid region under the scorching sun, and the soldiers ran out of water. They were exhausted and severely dehydrated. Seeing his troops on the verge of collapse, Cao Cao rode to the front and, pointing his whip towards a distant hill, announced, “Soldiers! I see a large orchard of plums just over that hill! The plums are ripe and sour, and they will surely quench our thirst!” Upon hearing this, the soldiers imagined the sour taste of the plums, and their mouths began to water. This physiological reaction gave them a burst of energy and morale, allowing them to march on until they reached a real water source. In its original context, the story showcases Cao Cao's cleverness and resourcefulness (智谋, zhìmóu) as a leader—using psychology to overcome a physical crisis. However, the modern meaning of the idiom has shifted. Today, it is used almost exclusively in a negative sense to criticize someone for engaging in self-deception or relying on an unrealistic fantasy. Comparison to a Western Concept: This is different from “positive thinking” or “visualization.” Positive thinking is a motivational tool used to spur action. `望梅止渴` describes a situation where the fantasy *replaces* action. It's closer to the English idiom “building castles in the air,” but with an added element of using that fantasy to soothe a present discomfort. It’s the difference between “I'm imagining my goal to motivate myself to work harder” and “I'm imagining my goal so I can feel good without having to work at all.”
In modern Chinese, `望梅止渴` is a common idiom used to describe situations of wishful thinking where no concrete solution is present. It carries a critical or slightly pitiful connotation.