bosom buddy

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Also see: buddy

Concise Oxford English Dictionary © 2008 Oxford University Press:
bosom/ˈbʊzəm/

▶noun

• 1 a woman's breast or chest.

  ■ the breast as the seat of emotions: quivering dread was settling in her bosom.

• 2 a person's loving care or protection: Bruno went home each night to the bosom of his family.

▶adjective (of a friend) very close.

– derivatives
-bosomed adjective,
bosomy adjective.

– origin OE bōsm, of W. Gmc origin.