a. to change the course of a sailing vessel by bringing the head into the wind and then causing it to fall off on the other side: He ordered us to tack at once.
b. (of a sailing vessel) to change course in this way.
c. to proceed to windward by a series of courses as close to the wind as the vessel will sail.
To help improve the meaning of these lyrics, visit “Rime Of The Ancient Mariner” by Samuel Taylor Coleridge and leave a comment on the lyrics box