A group of three
A string with a loop at the end for lifting warp threads, in a loom.
A brace and a half; a tierce.
A set of three animals (especially greyhounds, foxes, bucks, and hares;)
A strap, cord or rope with which to restrain an animal, often a dog.
A leg rope.
To fasten or secure with a leash.
to curb, restrain
The practice of three people having sex, i.e. having threesomes.
The practice of two people having sex while a third person watches (and may or may not take part).