plural best friends
Definition of best friend
1
: a person's closest and dearest friend
She's my best friend. We have been best friends since high school.
2
: a person's most desirable or valuable possession or resource
Diamonds may be a girl's best friend, but gold is more affordable.— William Giese Lycra-cotton leggings and tunic tops are the pregnant woman's best friend, sartorially speaking.— Anne Reeks When cops bang on the door, the toilet is a drug dealer's best friend.— Frederick Kaufman
— see also man's best friend
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“Best friend.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/best%20friend. Accessed 17 Oct. 2021.
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Time Traveler for best friend
The first known use of best friend was in the 13th century
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