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Open the tool →落叶知秋 (luò yè zhī qiū) is a Chinese idiom (chengyu) meaning “a single fallen leaf signals the arrival of autumn”.
落叶知秋 is pronounced luò yè zhī qiū in Mandarin Chinese.
Literally, 落叶知秋 means “Falling leaves know autumn”. It is used to mean “a single fallen leaf signals the arrival of autumn”.
指见到落地的黄叶,知道已经是秋天快到了。