against /əˈɡenst, əˈɡeinst/ prep. 1.反对：Public opinions were strongly against his visit to the country. 舆论强烈反对他访问这个国家。2.违背，逆：against one’s will 违心 The ship is sailing against the wind. 船逆风航行。3.倚靠：He leaned against the door.他倚靠着门。4.准备：Squirrels store up food against the winter. 松鼠贮存食物以备过冬。5. 用于习语up against 面临困难等（见up条）