(~s)
1.
A ~ is a container on wheels which is pulled by a car or other vehicle and which is used for transporting large or heavy items.
N-COUNT
2.
A ~ is the long rear section of a lorry or truck, in which the goods are carried.
N-COUNT
3.
A ~ 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. (mainly AM; in BRIT, use caravan )
N-COUNT
4.
A ~ for a film or television programme is a set of short extracts which are shown to advertise it.
N-COUNT: oft N for n