shì​bàn​gōng​bèi

twice the result with half the effort

Senses

事半功倍 shì​bàn​gōng​bèi twice the result with half the effort

to achieve great results with very little effort; efficient

References

antonym 劳而无功/勞而無功 事半功倍/事半功倍
antonym 事倍功半/事倍功半 事半功倍/事半功倍