Source : Webster's Revised Unabridged Dictionary (1913)

Bosom \Bos"om\, a.
   1. Of or pertaining to the bosom.

   2. Intimate; confidential; familiar; trusted; cherished;
      beloved; as, a bosom friend.

Bosom \Bos"om\ (b[oo^]z"[u^]m), n. [AS. b?sm; akin to D. bozem,
   Fries. b?sm, OHG. puosum, G. busen, and prob. E. bough.]
   1. The breast of a human being; the part, between the arms,
      to which anything is pressed when embraced by them.

            You must prepare your bosom for his knife. --Shak.

   2. The breast, considered as the seat of the passions,
      affections, and operations of the mind; consciousness;
      secret thoughts.

            Tut, I am in their bosoms, and I know Wherefore they
            do it.                                --Shak.

            If I covered my transgressions as Adam, by hiding my
            iniquity in my bosom.                 --Job xxxi.
                                                  33.

   3. Embrace; loving or affectionate inclosure; fold.

            Within the bosom of that church.      --Hooker.

   4. Any thing or place resembling the breast; a supporting
      surface; an inner recess; the interior; as, the bosom of
      the earth. ``The bosom of the ocean.'' --Addison.

   5. The part of the dress worn upon the breast; an article, or
      a portion of an article, of dress to be worn upon the
      breast; as, the bosom of a shirt; a linen bosom.

            He put his hand into his bosom: and when he took it
            out, behold, his hand was leprous as snow. --Ex. iv.
                                                  6.

   6. Inclination; desire. [Obs.] --Shak.

   7. A depression round the eye of a millstone. --Knight.

Bosom \Bos"om\, v. t. [imp. & p. p. {Bosomed} (-[u^]md); p. pr.
   & vb. n. {Bosoming}.]
   1. To inclose or carry in the bosom; to keep with care; to
      take to heart; to cherish.

            Bosom up my counsel, You'll find it wholesome.
                                                  --Shak.

   2. To conceal; to hide from view; to embosom.

            To happy convents bosomed deep in vines. --Pope.

Source : WordNet®

bosom
     n 1: the chest considered as the place where secret thoughts are
          kept; "his bosom was bursting with the secret"
     2: a person's breast or chest
     3: cloth that covers the chest or breasts
     4: a close affectionate and protective acceptance; "his willing
        embrace of new ideas"; "in the bosom of the family" [syn:
        {embrace}]
     5: the locus of feelings and intuitions; "in your heart you
        know it is true"; "her story would melt your bosom" [syn:
        {heart}]
     6: either of two soft fleshy milk-secreting glandular organs on
        the chest of a woman [syn: {breast}, {knocker}, {boob}, {tit},
         {titty}]

bosom
     v 1: hide in one's bosom; "She bosomed his letters"
     2: hug, usually with fondness; "Hug me, please"; "They
        embraced" [syn: {embrace}, {hug}, {squeeze}]