Aback

[Sarah]

Backward against the mast;-said of the sails when pressed bythe wind. Totten. To be taken aback. (a) To be driven backwardagainst the mast; -- said of the sails, also of the ship when thesails are thus driven. (b) To be suddenly checked, baffled, ordiscomfited. Dickens.

[Sarah]

Taken Aback
Surprised, Shocked.

[Kai]

Aback in Yachting. When the wind is on the wrong side of the sail.

[Tina]

Toward or situated to the rear; back.

[Rihanna]

to be very shocked or surprised: