Oxford Dictionary
build-up
build-up ▶noun [ usu. in sing. ] 1 a gradual accumulation or increase, typically of something negative that leads to a problem: the build-up of carbon dioxide in the atmosphere. 2 a period of excitement and preparation before a significant event: the build-up to Christmas.
Oxford Thesaurus
build-up
build-up noun 1 the build-up of military strength: increase, growth, expansion, spread, enlargement, escalation, development, accumulation, proliferation, multiplication, snowballing, mushrooming. ANTONYMS decrease. 2 the build-up of carbon dioxide in the atmosphere: accumulation, building up, accretion, gathering, amassing. 3 the build-up for the World Cup: publicity, promotion, advertising, puff, marketing, propaganda; informal hype, plugging, plug, ballyhoo, hoo-ha.
Sanseido Wisdom Dictionary
build-up
bu í ld- ù p bu í ld ù p 名詞 1 U 増加 ; 増強 ; 増員 .2 C (新人 新製品などの )宣伝, 売り込み .3 C 【イベントなどの 】準備期間 «to » .