VERB (3)

1. cover with a protective sheathing;
- Example: "sheathe her face"

2. enclose with a sheath;
- Example: "sheathe a sword"

3. plunge or bury (a knife or sword) in flesh;

The Collaborative International Dictionary of English v.0.48:

Sheathe \Sheathe\, v. t. [imp. & p. p. Sheathed; p. pr. & vb.
   n. Sheating.] [Written also sheath.]
   1. To put into a sheath, case, or scabbard; to inclose or
      cover with, or as with, a sheath or case.
      [1913 Webster]

            The leopard . . . keeps the claws of his fore feet
            turned up from the ground, and sheathed in the skin
            of his toes.                          --Grew.
      [1913 Webster]

            'T is in my breast she sheathes her dagger now.
                                                  --Dryden.
      [1913 Webster]

   2. To fit or furnish, as with a sheath. --Shak.
      [1913 Webster]

   3. To case or cover with something which protects, as thin
      boards, sheets of metal, and the like; as, to sheathe a
      ship with copper.
      [1913 Webster]

   4. To obtund or blunt, as acrimonious substances, or sharp
      particles. [R.] --Arbuthnot.
      [1913 Webster]

   To sheathe the sword, to make peace.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sheathe
    v 1: cover with a protective sheathing; "sheathe her face"
    2: enclose with a sheath; "sheathe a sword" [ant: unsheathe]
    3: plunge or bury (a knife or sword) in flesh