牵一发而动全身 (牽一髮而動全身) qiān yīfā ér dòng quánshēn

qiān yīfā ér dòng quánshēn phrase pull one hair and the whole body moves; a slight change will affect everything else
Domain: Modern Chinese 现代汉语
Notes: (CC-CEDICT '牽一髮而動全身')