What does the Chinese word 走水 (주수) literally mean?

 ANSWER: "running (走) water (水)"

So, when the Chinese use 走水 (주수) to mean "to leak" or "to flow," it makes sense, but when they also use it to mean "to catch fire" or "to be on fire," it does not make sense.

This image comes from HERE.

No wonder only 1.3 billion people in the world speak Chinese.