'bosom' originates from Old English, specifically the word 'bōsm', where 'bōsm' meant 'breast' or 'chest'.

'bōsm' changed from Old English word 'bōsm' and eventually became the modern English word 'bosom'.

Initially, it meant 'breast' or 'chest', but over time it evolved into its current meaning of 'a close or intimate place or situation'.