What is "cushioned hammer"

Cushion \Cush"ion\ (k[oo^]sh"[u^]n), v. t. [imp. & p. p. Cushioned (-[u^]nd); p. pr. & vb. n. Cushioning.]

1. To seat or place on, or as on a cushion.

   Many who are cushioned on thrones would have remained in obscurity.
   --Bolingbroke.

2. To furnish with cushions; as, to cushion a chaise.

3. To conceal or cover up, as under a cushion.

   Cushioned hammer, a dead-stroke hammer. See under Dead-stroke.