Origin of unbosomun- + bosom
verbun·bos·omed, un·bos·om·ing, un·bos·oms
- To confide (one's thoughts or feelings).
- To relieve (oneself) of troublesome thoughts or feelings.
(third-person singular simple present unbosoms, present participle unbosoming, simple past and past participle unbosomed)
un- +"Ž bosom (“the seat of emotions").