







余勇可贾 is a Chinese idiom (chengyu) meaning “to still have strength, energy, or courage left to expend”. To have reserves of power or capability remaining. Literally, “Remaining strength/valor can be sold/bartered”.
During the Spring and Autumn Period, the State of Qi simultaneously attacked the states of Lu and Wey. The State of Jin seized this opportunity to attack Qi.
Duke Qing of Qi dispatched General Gao Gu to lead his army in resistance. Gao Gu, driving a war chariot, charged into the Jin army's camp and captured a Jin general alive.
After returning to his camp and presenting the captive to Duke Qing of Qi, he tied a mulberry tree to his war chariot and drove it around, shouting to his soldiers, "I still have strength to spare that can be sold!"