bosom friend literary
bosom buddy literary
bosom pal literary

He usually was when his bosom friend Reggie had in one way or another come to grief.

"Still, dear, you must be very lonely, and feel the need of a bosom friend."

I wonder if Diana is to be my bosom friend.

They were bosom friend and leaders of political party.

They were bosom friends, those two, and never far apart.

He twinkled at me as though we were suddenly bosom friends.

They all fit with him like a bosom friend.

Strange that the words at home with me so long Should fly like bosom friends when needed most.

See that you and he are not exactly bosom friends?

They became bosom friends, and somehow the talk always got around to pies.