Bosom friend

A very close friend. One that you can share everything with. Made popular by Anne in Anne of Green Gables.

Anne: "Diana Barry is my bosom friend"

by TheRealIndianaJones January 2, 2016

bosom friend

An intimate friend; a really kindred spirit to whom you can confide your inmost soul. Very hard to find.

1) I'm so glad I met Lin. She is a bosom friend!

2) I never expected to find such a bosom friend, but I'm glad I did.

by Can't you guess who I am??? June 15, 2010