Sneck up

from The Collaborative International Dictionary of English v.0.48

Sneck \Sneck\, v. t. [See {Snatch}.]
   To fasten by a hatch; to latch, as a door. [Scot. & Prov.
   Eng.]
   [1913 Webster]

   {Sneck up}, be silent; shut up; hold your peace. --Shak.
      [1913 Webster]