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

Coincidentally, his kids and best friend already had tickets to the game. —Zack Meisel, New York Times, 16 May 2026

Beckham hopes other dog owners practice caution when hiring anyone to care for their best friend. —CBS News, 16 May 2026

For Off Campus actresses Ella Bright and Mika Abdalla, who portray best friends and roommates Hannah Wells and Allie Hayes in Season 1 of the Prime Video adaptation based on Elle Kennedy’s books, a key scene in the finale served as their chemistry read. —Dessi Gomez, Deadline, 15 May 2026

Beyond the central romance, season 1 also introduces Graham’s hockey teammates and housemates, John Logan (Antonio Cipriano), John Tucker (Jalen Thomas Brooks) and Dean DiLaurentis (Stephen Kalyn), along with Hannah’s best friend, Allie (Mika Abdalla). —Nasha Smith, PEOPLE, 15 May 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