Definitions from Wiktionary ( )

▸ noun:  Someone who or something that trails (follows behind); something that is trailing.
▸ noun:  Part of an object which extends some distance beyond the main body of the object.
▸ noun:  An unpowered wheeled vehicle (not a caravan or camper) that is towed behind another, and used to carry equipment, etc, that cannot be carried in the leading vehicle.
▸ noun:  (US) A furnished vehicle towed behind another, and used as a dwelling when stationary; a caravan; a camper.
▸ noun:  (US) A prefabricated home that could be towed to a new destination but is typically permanently left in an area designated for such homes.
▸ noun:  (chiefly US, media) A preview of a film, video game or TV show.
▸ noun:  A short blank segment of film at the end of a reel, for convenient insertion of the film in a projector.
▸ noun:  (computing) The final record of a list of data items, often identified by a key field with an otherwise invalid value that sorts last alphabetically (e.g., “ZZZZZ”) or numerically (“99999”); especially common in the context of punched cards, where the final card is called a trailer card.
▸ noun:  (networking) The last part of a packet, often containing a check sequence.
▸ verb:  To load on a trailer or to transport by trailer.

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