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. …婴儿依偎在其丰满乳房上的一位年轻母亲。

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. 他们曾是知心的伙伴。