trailer ( trailers plural )
1 n-count A trailer is a container on wheels which is pulled by a car or other vehicle and which is used for transporting large or heavy items.
2 n-count A trailer is the long rear section of a lorry or truck, in which the goods are carried.
3 n-count A trailer is a long vehicle without an engine which people use as a home or as an office and which can be pulled behind a car.
in BRIT, use caravan
4 n-count A trailer for a film or television programme is a set of short extracts which are shown to advertise it. oft N for n
semi-trailer ( semi-trailers plural ) , semitrailer A semi-trailer is the long rear section of a truck or lorry that can bend when it turns.
in BRIT, use trailer
trailer park ( trailer parks plural ) , trailer court A trailer park is an area where people can pay to park their trailers and live in them.
in BRIT, use caravan site
Some people use trailer trash to refer to poor people who live in trailer parks and who they think are vulgar or worthless. This use could cause offence.
trailer truck ( trailer trucks plural ) A trailer truck is a truck or lorry that is made in two or more sections which are joined together by metal bars, so that the vehicle can turn more easily.
in BRIT, usually use articulated lorry