层出不穷 céngchūbùqióng HSK7 to emerge one after another Origin Definitions Defs Strokes Stroke Words Sentences Sents 层 層 céng to pile up (literary) To overlap; to pile one on top of another; repeated出 chū verbnoun to appear to appear; to manifest; to show; to become visible不穷 不窮 bùqióng endless endless; boundless; inexhaustible