Etymology From Middle English vangen, southern variant of fangen (“to seize, catch”), from Old English fōn (“to take, grasp, seize, catch, capture, make prisoner, receive, accept, assume, undertake, meet with, encounter”), and Old Norse fanga (“to fetch, capture”), both from Proto-Germanic *fanhaną, *fangōną (“to catch, capture”), from Proto-Indo-European *ph₂ḱ- (“to fasten, place”). Cognate with West Frisian fange (“to catch”), Dutch vangen (“to catch”), German fangen (“to catch”), Danish fange (“to catch”). More at fang.
On a catamaran, the curved track has enough beam to allow the mainsheet to vang the boom throughout its entire arc.1998 February, Yachting, page 62:
The Patented Hoyt Jib Boom adds to offwind speed by vanging the jib and acting as a built in whisker pole.1999 January, Cruising World, volume 25, number 1, page 80:
1 more example
We needed to vang the main, pull it down to flatten it, and make it more efficient.2018, Henry R. Danielson, Island People: Finding Our Way: