N-COUNT
（對某活動的）宣傳，造輿論
The build-up to an event is the way that journalists, advertisers, or other people talk about it a lot in the period of time immediately before it, and try to make it seem important and exciting.
例句
We should wait at least until winter before we start the build-up to Christmas...
我們至少要等到冬天再開始著力營造圣誕節的氣氛。
The exams came, almost an anticlimax after the build-up that the students had given them.
在學生們一番忙碌準備之后，隨之而來的考試卻出乎意料地平淡。