Tra từ trailer - Từ điển Oxford Advanced Learner 8th

trail·er [trailer trailers trailered trailering] BrE [ˈtreɪlə(r)] NAmE [ˈtreɪlər] noun
1. a truck, or a container with wheels, that is pulled by another vehicle
•a car towing a trailer with a boat on it
see also ↑tractor-trailer
2. (NAmE) (BrE mobile home)a vehicle without an engine, that can be pulled by a car or truck or used as a home or an office when it is parked
•a trailer park (= an area where ↑trailers are parked and used as homes)
3. (NAmE) = ↑mobile home (¹)
4. (especially BrE) (NAmE usually preview)a series of short scenes from a film/movie or television programme, shown in advance to advertise it
See also: ↑mobile home ▪ ↑preview

Synonyms:
advertisement
publicity • ad • commercial • promotion • trailer
These are all words for a notice, picture or film/movie telling people about a product, job or service.
advertisement • a notice, picture or film/movie telling people about a product, job or service; an example of sth that shows its good qualities; the act of advertising sth and making it public: ▪ Put an advertisement in the local paper to sell your car. ◇ ▪ Dirty streets are no advertisement for a prosperous society.
publicity • [U] the business of attracting the attention of the public to sb/sth such as a company, book, film/movie, film/movie star or product; the things that are done to attract attention: ▪ She works in publicity. ◇ ▪ There has been a lot of advance publicity for her new film.
ad • (informal) a notice, picture or film/movie telling people about a product, job or service: ▪ We put an ad in the local paper. ◇ ▪ an ad for a new chocolate bar
commercial • an advertisement on television or on the radio.
promotion • a set of advertisements for a particular product or service; activities done in order to increase the sales of a product or service: ▪ a special promotion of local products ◇ ▪ She works in sales and promotion.
trailer • (especially BrE) a series of short scenes from a film/movie or television programme, shown in advance to advertise it.
(a/an) advertisement/publicity/ad/commercial/promotion/trailer for sth
a TV/television/radio/cinema advertisement/ad/commercial/promotion
to run/show a(n) advertisement/ad/commercial/trailer

Example Bank:
•He featured in the trailer for the movie.
•a broken-down car on a trailer
•a trailer carrying a motor boat
•The review said that if you've seen the trailer, you needn't bother watching this film.