What does "coffin" mean?

Additional senses

1. 2.A basket. [Obs.] Wyclif (matt. xiv. 20).
2. 3.A casing or crust, or a mold, of pastry, as for a pie. Of the paste a coffin I will rear. Shak.
3. 4.A conical paper bag, used by grocers. [Obs.] Nares.
4. 5.(Far.) The hollow crust or hoof of a horse's foot, below the coronet, in which is the coffin bone. Coffin bone, the foot bone of the horse and allied animals, inclosed within the hoof, and corresponding to the third phalanx of the middle finger, or toe, of most mammals. -- Coffin joint, the joint next above the coffin bone.
5. 6.To inclose in, or as in, a coffin. Would'st thou have laughed, had I come coffined home Shak. Devotion is not coffined in a cell. John Hall (1646).