A friend of the bosom & A bosom friend
The word below A and B are all correct to say?
A. a friend of the bosom
B. a bosom friend
(A is what I ran into from a certain American film and B is from English dictionary, which means 'close friend')
If they are all correct, are the following two sentences perfectly correct to say?
a. She seems to have become bosom friends with your children.
b. She seems to have become friends of the bosom with your children.
Origianl text:
M: Tell me, is Mrs. Van Hopper a friend of yours or just a relation?
W: No, she's my employer. I'm what is known as "a paid companion.
M: I didn't know companionship could be bought.
W: I looked at the word "companion" in the dictionary once. It said, "a friend of the bosom."