1. crupper, strap truss.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
At the side is a cuir bouilli crupper as worn by the English heavy cavalry in the sixteenth century.
"Authorised Guide to the Tower of London"
W. J. Loftie
It went down on its knees and elbows, bales of cotton were piled alongside, and Miss B. and G. climbed up these on to the pad, and I got up by its tail and the crupper.
"From Edinburgh to India & Burmah"
William G. Burn Murdoch