http://tinyurl.com/3d9kg4
"
Proto-Kartvelian: *čxwerḳ-
Meaning: twig
Georgian: čxverḳ-
Megrelian: čxvaḳ-
Megrelian meaning: to plait a fence
Laz: čxverḳ-
Laz meaning: dry branch
Comments: EWK 442-443.
"
twig/Zweig doesn't have a proper etymology, I believe, nor do Da.
kvist ibd. or kvissel "branch in channel" . Note Megrelian. Megrelian
and Laz are together called Zan or Colchidian.
Torsten