best friend

noun
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

First Known Use of best friend

13th century, in the meaning defined at sense 1

Keep scrolling for more

Learn More About best friend

Time Traveler for best friend

Time Traveler

The first known use of best friend was in the 13th century

See more words from the same century

Dictionary Entries Near best friend

best foot

best friend

best girl

See More Nearby Entries 

Statistics for best friend

Cite this Entry

“Best friend.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/best%20friend. Accessed 17 Oct. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!