quoiler
/ˈkwɔɪlə/Now English regional (southern )
noun
Chiefly in plural A leather strap passing around the hindquarters of a carthorse, which allows the cart to be driven backwards or downhill; the breeching. Frequently attributive, as quoiler-harness, quoiler-horse.
Origin
Late 17th century; earliest use found in The London Gazette. Probably a variant of coiler.