牽一髮而動全身 [ㄑㄧㄢ ㄧ ㄈㄚˋ ㄦˊ ㄉㄨㄥˋ ㄑㄩㄢˊ ㄕㄣ; qian1 yi1 fa4 er2 dong4 quan2 shen1] lit. pull one hair and the whole body moves fig. a slight change will affect everything else the butterfly effect ◄ ►
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