四兩撥千斤

lit. four ounces can move a thousand catties (idiom) / fig. to achieve much with little effort

four / 4

two / both / some / a few / tael, unit of weight equal to 50 grams (modern) or 1⁄16 of a catty 斤[jin1] (old)

to push aside with the hand, foot, a stick etc / to dial / to allocate / to set aside (money) / to poke (the fire) / to pluck (a string instrument) / to turn round / classifier: group, batch

thousand

see 鞦韆|秋千[qiu1 qian1]

catty / (PRC) weight equal to 500 g / (Tw) weight equal to 600 g / (HK, Malaysia, Singapore) slightly over 604 g