strapper

(Anglès)

A large, strong, robust person (usually a man).
A person who works with straps, as on leather goods.
One who straps horses; now, specifically, someone employed to attend and groom racehorses.
(archaic) A cow which yields a small amount of milk.
A wire that joins two light switches so that a light can be turned off or on from either switch.

From strap + -er, principally strap + -er (agent noun suffix). The sense referring to a poorly producing milk cow (from strap + -er) came from a dialectal sense of the verb strap as a troponym of milk: not even the most skilful milking action could coax enough milk from the udder.