Not to be confused with four-letter words, these are words of Chinese origin used idiomatically for linguistic efficiency. A few examples:
십중팔구(十中八九) lit. meaning: 8 or 9 out of 10; use: “most likely”
세면도구 (洗面道具) lit. meaning: syllables of various personal hygiene activities; use: “toiletries”
유구무언 (有口無言) lit. meaning: to have nothing to say; use: “offer no excuse”
천지차이 (天地差異) lit. meaning: the difference between the sky and the earth; use: “to be worlds apart”
일석이조 (一石二鳥) lit. meaning: one stone two birds; use: same as the English “hit two birds with one stone”
춘하추동 (春夏秋冬) lit. meaning: spring, summer, autumn, winter; use: “the four seasons”
산천초목 (山川草木) lit. meaning: mountains, streams, plants, grass; use: “nature”

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