Meaning

noun a unit of force equal to the force exerted by gravity; used to indicate the force to which a body is subjected when it is accelerated

verb turn to the right side

verb give a command to a horse to turn to the right side

originUnknown. Possibly from gowl (“vagina, vulva”), a slang term in Ireland. Compare Irish gabhal (“fork, crotch”).

Etymology from Wiktionary, CC BY-SA 3.0