chuck 2 
(chŭk)
(chŭk)n.
1. A cut of beef extending from the neck to the ribs and including the shoulder blade.
2.
a. A clamp that holds a tool or the material being worked in a machine such as a lathe.
b. A clamping device for holding a drill bit.
3. Informal Food.
[Dialectal chuck, lump, perhaps variant of CHOCK.]