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

The series also stars Aurora Perrineau as Percy’s best friend of adulthood, Chantal; Abigail Cowen as her childhood best friend Delilah and Joseph Chiu as Sam’s childhood best friend Jordie. — Dessi Gomez, Deadline, 27 June 2026

Regina Hall plays Brenda Meeks, Cindy’s best friend. — Skyler Trepel, Entertainment Weekly, 27 June 2026

After being prosecuted at the age of 20, Powell, now 41, was released after a judge overturned his sentence of life plus five years on murder charges in the death of his best friend, Shah Walton – charges that prosecutors later agreed were unfounded. — Andy Rose, CNN Money, 26 June 2026

The aquamarine is from a famed Brazilian mine and was given to her by one of her best friends, Lúcia Flecha de Lima. — Hadley Hall Meares, Vanity Fair, 26 June 2026

Word History

First Known Use

13th century, in the meaning defined at sense 1

Phrases Containing best friend

• man's best friend

Rhymes for best friend

• amend
• append
• ascend
• attend
• backend
• befriend
• boyfriend
• commend
• compend
• contend
• defend
• depend