noun [C] [usu.sing] 1 a build-up (of sth) an increase of sth over a period 逐步增加；逐步加强: The build-up of tension in the area has made war seem more likely. 该地区局势日趋紧张，战事似乎一触即发。
2 a build-up (to sth) a period of preparation or excitement before an event 事前的准备阶段或紧张时刻: The players started to get nervous in the build-up to the big game. 大赛开始前一刻运动员们都紧张起来。