bosom

1. N-COUNT A woman's breasts are sometimes referred to as her bosom or her bosoms. 乳房[老式]

...a young mother with a baby resting against her ample bosom. …嬰兒依偎在其豐滿乳房上的一位年輕母親。

2. ADJ A bosom buddy is a friend who you know very well and like very much. 知心的[ADJ n]

They were bosom buddies. 他們曾是知心的夥伴。