Merriam-Webster Collegiate Dictionary - chuck

 I. verb  Etymology: Middle English chukken, of imitative origin  Date: 14th century cluck  II. noun  Etymology: perhaps from ~ chicken  Date: 1595 — used as an endearment  III. transitive verb  Etymology: origin unknown  Date: 15th century  1. pat, tap  2.  a. toss, throw  b. discard ~ed his old shirt ~ it out with the trash  c. dismiss, oust — used especially with out was ~ed out of office  3. give up ~ed his job  IV. noun  Date: 1611  1. a pat or nudge under the chin  2. an abrupt movement or toss  V. noun  Etymology: English dialect ~ lump  Date: 1723  1. a cut of beef that includes most of the neck, the parts about the shoulder blade, and those about the first three ribs — see beef illustration  2. chiefly West food  3. an attachment for holding a workpiece or tool in a machine (as a drill or lathe)