It also happens in Korean. The green light is 파란불, literally "blue light". (Thankfully, traffic lights are actually green around here.) In modern usage, 파란 mean

It also happens in Korean. The green light is 파란불, literally "blue light". (Thankfully, traffic lights are actually green around here.) In modern usage, 파란 means "blue" most of the time, but its variant 푸른 continues to mean "grue". The sky is grue, and so is the pasture. I don't think Korean even has a native word for "green". The most common word for "green" in modern usage is 녹색, which comes from the Chinese characters 綠色 and feels more like a technical term than a native Korean word when placed in a sentence.