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

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "sheathe":
   apparel, array, attire, bedeck, bedrape, board, box, brick,
   bundle up, case, clad, clapboard, clothe, cover, crate, deck,
   dight, drape, dress, dud, embox, embrace, encapsulate, encase,
   enclothe, endue, enfold, enrobe, enshroud, envelop, enwrap, face,
   garb, garment, glass, glaze, habilitate, invest, jacket, lap, lath,
   muffle up, pack, package, panel, paper, plank, rag out, raiment,
   revet, robe, shake, shingle, shroud, side, skin, slate, smother,
   stone, surround, swaddle, swathe, thatch, tile, tire, veneer,
   wall in, wall up, wallpaper, weatherboard, wrap, wrap about,
   wrap up