best friend

noun

plural best friends

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

Examples of best friend in a Sentence

Recent Examples on the Web

Having adopted her crusade following the suicide of her best friend, the story of whose rape nobody believed, Cassie will not rest until she's gotten revenge, not only on the perpetrators but the whole system that enables them — and that's a promise. —EW.com, 31 May 2024

These clever puns, song lyrics, and quotes make the perfect Instagram captions for a girls' trip with your best friends. —Maya Kachroo-Levine, Travel + Leisure, 29 May 2024

Jeff: Although, [the] more fun story is…her and her best friend borrowed their parents’ car and drove from Toronto to New York to see the Ramones, and the Dickies opened up. —Brendan Hay, SPIN, 23 May 2024

Many people count their siblings among their best friends. —Suzanne Nuyen, NPR, 22 May 2024

Word History

First Known Use

13th century, in the meaning defined at sense 1

Phrases Containing best friend

• man's best friend