Definition of build-up noun from the Oxford Advanced Learner's Dictionary

     

    build-up

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1[singular, uncountable] an increase in the amount of something over a period of time a steady build-up of traffic in the evenings carbon dioxide build-up in the atmosphere The leak led to a slow build-up of carbon dioxide.
  2. 2[countable, usually singular] build-up (to something) the time before an important event, when people are preparing for it the build-up to the President’s visit the build-up to her wedding
  3. 3[countable, usually singular] a very positive and enthusiastic description of something that is going to happen, that is intended to make people excited about it The media have given the show a huge build-up.
See the Oxford Advanced American Dictionary entry: build-up