The Collaborative International Dictionary
Sworn \Sworn\, p. p. of Swear.
Sworn brothers, originally, companions in arms who took an oath to share together good and bad fortune; hence, faithful friends.
Sworn enemies, determined or irreconcilable enemies.
Sworn friends, close friends.
Usage examples of "sworn friends".
Does it not seem fantastic to you that of all the Amazons of Darkover, you should fall into Jaelle's hands, and that the two of you should be so tested that you have become sworn friends as well?
A moment or two later the two sworn friends of the Pension bill were talking together, earnestly, and seemingly unconscious of the moving throng about them.
The gamekeeper was avoided, and his friend Furness fell into great disrepute, after his voluntarily coming forward and giving evidence against old and sworn friends.
I beat some sense into him, and we became sworn friends after that.