chū cāo
to drill
to exercise
to go outdoors for physical exercise
chū cǎo
(of Taiwan aborigines) to go on a headhunting expedition
Cáo Cān
Cao Can (-190 BC), second chancellor of Han Dynasty, contributed to its founding by fighting on Liu Bang's 劉邦|刘邦[Liu2 Bang1] side during the Chu-Han Contention 楚漢戰爭|楚汉战争[Chu3 Han4 Zhan4 zheng1]
also pr. [Cao2 Shen1]