- 1a truck, or a container with wheels, that is pulled by another vehicle a car towing a trailer with a boat on it see tractor-trailer
- 2a 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) compare camper, mobile home
- 3a series of short scenes from a movie or television program, shown in advance to advertise it synonym advertisement
Check pronunciation: trailer