trailer (Noun) — Someone who takes more time than necessary; someone who lags behind.
trailer (Noun) — An advertisement consisting of short scenes from a motion picture that will appear in the near future.
trailer (Noun) — A large transport conveyance designed to be pulled by a truck or tractor.
trailer (Noun) — A wheeled vehicle that can be pulled by a car or truck and is equipped for occupancy.
trailer (Noun) — A trailer having wheels only in the rear; the front is supported by the towing vehicle.
trailer (Verb) — Transport on a trailer. ex. "we had to trailer my old car to the dump"