horse trailer
US /ˈhɔːrs ˌtreɪ.lər/
UK /ˈhɔːrs ˌtreɪ.lər/

1.
a trailer designed for transporting horses
:
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We loaded the horses into the horse trailer for the trip to the show.
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He's looking to buy a new horse trailer with more space.
a trailer designed for transporting horses