aback
adv//aˈbak//bakåt, back, där bak
(archaic, Geordie) Towards the back or rear; backwards. [First attested prior to 1150.]
(nautical) Backward against the mast; said of the sails when pressed by the wind from the "wrong" (forward) side, or of a ship when its sails are set that way. [First attested in the late 17th century.]