build·up also build-up 
(bĭldŭp′)
(bĭldŭp′)n.
1. The act or process of amassing or increasing: a military buildup; a buildup of tension during the strike.
2. The result of building up: a pipe clogged by rust buildup.
3.
a. Widely favorable publicity, especially by a systematic campaign: The new movie was given a tremendous buildup in the media.
b. Extravagant praise.