0 the distance around the outside of a thick or fat object, like a tree or a body -- circunferencia, contorno
1 the strap that goes around the middle of a horse to keep the saddle (= rider’s seat) or the load in the right position -- cincha
Loosen the girth a little.
2 the measurement round a tree, a person’s waist etc -- contorno, circunferencia, perímetro
3 the strap that holds a saddle on a horse. -- cincha