noun
teachers and friends; mentors and friends
Refers collectively to one's teachers and friends, often in a context of learning and personal development.
彼は多くの師友に恵まれて成長した。
He grew up blessed with many teachers and friends.
noun
respected friend and mentor; friend who is like a teacher
A friend who is deeply respected and from whom one learns much, almost like a teacher. This usage is somewhat literary and less common in everyday speech.
彼は私にとって生涯の師友だ。
He is a lifelong respected friend and mentor to me.