teaser - definition and synonyms

noun [countable] 

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  1.   From our crowdsourced Open Dictionary
    a very short piece of film advertising a forthcoming film, TV programme etc., designed to create interest before a full trailer is released

    BBC is set to release the full trailer for the 50th anniversary episodeDay of the Doctortomorrow, but for now here’s a 14-second teaser trailer.

    Submitted from United Kingdom on 11/11/2013