Sentence:  As the anchor fetches her up, she will swing head to wind, bringing the head sails <WSD>aback</WSD>. 
Meaning of the word marked with <WSD> tags:  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.)<ref name=SOED/>