stratagem
/ˈstrætədʒəm/noun
1- a plan or scheme, especially one used to outwit an opponent or achieve an end计策, 计谋; 策略：
a series of devious stratagems.
一连串的诡计。
1.1
- mass noun archaic skill in devising such plans or schemes; cunning〈古〉诡计, 伎俩。
词源
late 15th cent. (originally denoting a military ploy)： from French stratagème, via Latin from Greek stratēgēma, from stratēgein 'be a general', from stratēgos, from stratos 'army' + agein 'to lead'.