2001,Lauren, “To me a best friend is everything”, in Marilyn Kielbasa, Janet Claussen, editors,Listen for a Whisper: Prayers, Poems, and Reflections by Girls[2],→ISBN:
Abest friendis always there for you, even when no one else is.
2004,Kenneth D. George,Keeping Mr. Right[3],→ISBN:
Beingbest friendsmeans giving up control and allowing ourselves to become vulnerable.
(informal)An object or concept considered very useful or helpful to someone.
2005,Jeff Davidson,The Complete Idiot's Guide to Getting Things Done,Penguin,→ISBN,page212:
You might even say, the bigger the problem, the greater your creative potential. The problem you're facing is yourbest friendbecause it will help to bring out the best in you.
2006,Christopher Duncan,The Career Programmer: Guerilla Tactics for an Imperfect World,Apress,→ISBN:
As an entrepreneur, a conservative financial outlook is yourbest friend.Live to fight another day. Running a business also involves a host of legal issues. Talk to some people you respect and trust, get some recommendations, and hire a good lawyer and accountant.
2010,Art Seamans,I See, Said the Blind Man,AuthorHouse,→ISBN,page48:
An instructor informed us that in battle, your rifle is yourbest friend.
Used other than figuratively or idiomatically:seebest,friend.