Etymology
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trailer (n.)

1580s, "hound or huntsman that follows a trail," agent noun from trail (v.). From 1610s as "Something that trails." From 1890 as "vehicle pulled by another;" originally a small carriage drawn along by a bicycle. Meaning "preview of a coming movie" first attested 1928. Trailer park "mobile home community" recorded by 1936. Trailer trash in use by 1986.

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Definitions of trailer

trailer (n.)
someone who takes more time than necessary; someone who lags behind;
Synonyms: dawdler / drone / laggard / lagger / poke
trailer (n.)
an advertisement consisting of short scenes from a motion picture that will appear in the near future;
Synonyms: preview / prevue
trailer (n.)
a large transport conveyance designed to be pulled by a truck or tractor;
trailer (n.)
a wheeled vehicle that can be pulled by a car or truck and is equipped for occupancy;
Synonyms: house trailer
From wordnet.princeton.edu