1. in opposition or hostility to (这里的aganist可以用于举个例子说:spoke against him) 就是像相反,敌视这样的意思2. contrary to (这里可以是说against the laws) 就是违反法律这样的3. in competition with (这个可以说是同行竞争的那种against)
against向背而行、向背而靠的意思,引申为 反对,对立,靠I am against this plan.我翻地此计划。this goes against her wish. 这有悖于她的愿望。The bike rests/stands against a tree. 自行车靠在树上。希望你明白了。