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

According to the outlet, Johnny and Matthew Gaudreau were replaced by their two best friends as groomsmen. —Miami Herald, 14 July 2025

Nic’s former connection, Cierra, who was kicked off the show for using a racial slur in a past social media post, subtly supported her former partner’s new connection with her best friend. —Monica Mercuri, Forbes.com, 14 July 2025

Upscale gyros are also doing well on the menu at Meze Table, a Greek catering business based in Bridgeport run by best friends and collaborators Elizabeth Gartelos Morris and Beth Salentiny. —Charlie Kolodziej, Chicago Tribune, 14 July 2025

Cohen — who also happens to be Parker's best friend — asked. —Carson Blackwelder, People.com, 14 July 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