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

But in reality, not having a best friend isn’t a sign of failure at all—and having one is an idealized yet unrealistic standard we’ve been taught to aspire to. —Jenna Ryu, SELF, 11 Sep. 2025

The show follows three best friends who stumble upon a magical cookbook that sets their lives on a path of thrilling adventures. —Anna Earl, Parents, 11 Sep. 2025

While saliva is your best friend during a blow job, there’s a more ladylike way to perform without spitting. —Ian Kumamoto, Them., 10 Sep. 2025

Voiced by Victoria Grobois, Nishio-san will become Amélie’s best friend and most beloved teacher. —David Ehrlich, IndieWire, 10 Sep. 2025

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