四两拨千斤

sì liǎng bō qiān jīn

lit. four ounces can move a thousand catties (idiom)

fig. to achieve much with little effort

four

liǎng

two

to push aside with the hand, foot, a stick etc

qiān

used in 鞦韆|秋千[qiu1 qian1]

jīn

catty