From Longman Dictionary of Contemporary Englishcarthorsecart‧horse /ˈkɑːthɔːs $ ˈkɑːrthɔːrs/ noun [countable] HBATTBa large strong horse, often used for pulling heavy loads
Examples from the Corpus
carthorse• A large carthorse stood drowsily eating something in the grass.• Two carthorses gone past, he announced: lots of good shit. 