from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. Nautical To turn (a square-rigged ship) about on the heel by bracing the sails aback.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To bring a square-rigged ship onto a new tack by hauling back the foresails whilst steering hard round
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To put (a vessel) on the other tack by veering her short round on her heel; -- so called from the circumstance of bracing the head yards abox (i. e., sharp aback, on the wind).
from The Century Dictionary and Cyclopedia
- to veer (a ship) round on her heel when it is impracticable to tack.
box1, to confine, reverse + haul.(American Heritage® Dictionary of the English Language, Fourth Edition)