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English definition of “trailer”

trailer

noun [C] uk   /ˈtreɪ.lər/ us    /-lɚ/

trailer noun [C] (VEHICLE)

a box on wheels that is pulled by a car and is used for taking things from one place to another: The car was pulling a trailer with a motorcycle on it. the separate back part of a large truck (also travel trailer) US for a caravan

trailer noun [C] (ADVERTISEMENT)

an advertisement for a film or a television or radio programme, consisting of short parts taken from it: I saw a trailer for the latest Spielberg film.
(Definition of trailer from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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