bos·om 
(bzəm, bzəm)
(bzəm, bzəm)n.
1.
a. The chest of a human: He held the sleepy child to his bosom.
b. A woman's breast or breasts.
2. The part of a garment covering the chest or breasts.
3. The security and closeness likened to being held in a warm familial embrace: We welcomed the stranger into the bosom of our family.
4. The chest considered as the source of emotion.
adj.
Beloved; intimate: a bosom friend.
[Middle English, from Old English bōsm.]