trailer
noun [ C ]
uk/ˈtreɪlər/ us MARKETING
an advertisement for a film, or television or radio programme, consisting of short parts taken from it:
You can watch a trailer for the new series online.
Hollywood has been circulating movie trailers on the Web for years.
TRANSPORT
the separate back part of a large truck used for carrying goods:
It isn't cost-effectitve to have trucks carrying half-empty trailers for part of their journey.
TRANSPORT
a box on wheels that is pulled by a car and is used for taking things from one place to another