Definition of gybes:
(v) :
(transitive, nautical) To shift a fore-and-aft sail from one side of a sailing vessel to the other, while sailing before the wind.
(v) :
(intransitive, nautical) Of a fore-and-aft sail or its boom: to shift, often forcefully and suddenly, from one side of a sailing vessel to the other.
(n) :
A manoeuvre in which the stern of a sailing vessel crosses the wind, typically resulting in the forceful and sudden sweep of the boom from one side of the vessel to the other.
(v) :
(intransitive, nautical) Generally of a small sailing vessel: to change tack with the wind crossing behind the vessel.
(n) :
(nautical) The act of gybing.
(n) :
A sudden shift of a sail's angle, or a sudden change in the direction that a vessel is sailing in.