/ ˈbʊzəm; NAmE / noun
1.
[ C ] a woman's chest or breasts :
her ample bosom
She pressed him to her bosom.
2.
[ C ] the part of a piece of clothing that covers a woman's bosom :
a rose pinned to her bosom
3.
the ~ of sth [ sing. ] a situation in which you are with people who love and protect you :
to live in the bosom of your family
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WORD ORIGIN
Old English bōsm , of West Germanic origin; related to Dutch boezem and German Busen .