From King Dictionary of Contemporary Englishbosombos‧om /ˈbʊzəm/ noun 1 [countable usually singular] writtenHBHDCC the front part of a woman’s chest She cradled the child to her bosom.2 [countable usually plural]HBH a woman’s breast3 the bosom of the family/the Church etc4 [singular] literaryEMOTIONAL a word meaning someone’s feelings and emotions, used especially when these are bad or unpleasant Drury harboured bitterness in his bosom.5 bosom friend/buddy/pal
Examples from the Corpus
bosomIt is now that man contemplates, for it is now that the sea is a bosom friend.She was breathing more quickly now and her bosom was again rising and falling defiantly.But she looks troubled, unsure of herself - perhaps because her bosom is merely average, one has seen bigger.Daniel harbored bitterness and anger in his bosom.Whatever swells as a result, it's unlikely to be the Mellor bosom.He was still my friend, my bosom friend.Half the stiff bosom shirts worn nowadays, the laundry is due on them yet.I am taking you to my home, into the very bosom of my family.
Origin bosom Old English bosm