The Collaborative International Dictionary of English v.0.48:
Chuck \Chuck\, n.
1. A slight blow or pat under the chin.
2. A short throw; a toss.
3. (Mach.) A contrivance or machine fixed to the mandrel of a
lathe, for holding a tool or the material to be operated
Chuck farthing, a play in which a farthing is pitched into
a hole; pitch farthing.
Chuck hole, a deep hole in a wagon rut.
Elliptic chuck, a chuck having a slider and an eccentric
circle, which, as the work turns round, give it a sliding
motion across the center which generates an ellipse.