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From The Collaborative International Dictionary of English v.0.48:
Unbosom \Un*bos"om\, v. t. [imp. & p. p. Unbosomed; p. pr. & vb. n. Unbosoming.] [1st pref. un- + bosom.] To disclose freely; to reveal in confidence, as secrets; to confess; -- often used reflexively; as, to unbosom one's self. --Milton. [1913 Webster]