best friend
Definition of best friend
: one's closest and dearest friend She's my best friend. We have been best friends since high school.
From the M-W Editors
Word by Word Definitions
: superlative ofgood
: excelling all others
: most productive of good : offering or producing the greatest advantage, utility, or satisfaction
: superlative ofwell
: in the best (see 1best) way : to greatest advantage
: most
: the best (see 1best) state or part
: one that is best
: the greatest degree of good or excellence
: to get the better of : outdo
: had best (see 2best 1)
: one attached to another by affection or esteem
: acquaintance
: one that is not hostile
: to act as the friend of : befriend
: to include (someone) in a list of designated friends on a person's social networking site
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