SG Heritage Dictionary

Stayer [Noun] Webster's Dictionary 1828

One that stops or restrains; one who upholds or supports; that which props.

Stayer [Noun] Webster's Dictionary 1913

One who upholds or supports that which props; one who, or that which, stays, stops, or restrains; also, colloquially, a horse, man, etc., that has endurance, an a race.