The Collaborative International Dictionary of English v.0.48:

Imbosom \Im*bos"om\, v. t. [imp. & p. p. Imbosomed; p. pr. &
   vb. n. Imbosoming.] [Pref. im- in + bosom. Cf. Embosom.]
   1. To hold in the bosom; to cherish in the heart or
      affection; to embosom.
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   2. To inclose or place in the midst of; to surround or
      shelter; as, a house imbosomed in a grove. "Villages
      imbosomed soft in trees." --Thomson.
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            The Father infinite,
            By whom in bliss imbosomed sat the Son. --Milton.
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