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

This act, the abandonment of his best friend in his greatest time of need, is the greatest shame and weight that will haunt Ivan for the rest of his life. —Literary Hub july 1, Literary Hub, 1 July 2025

Sarkis and Tuckman offer these tips for those who may be struggling with time blindness: Alarms and scheduling apps are your best friends. —Charles Trepany, USA Today, 30 June 2025

The sitcom centered on the life of Ellis' Joan, a lawyer living in Los Angeles who pulls three friends together to form an unbreakable bond - Maya (Brooks), Joan's assistant at her law firm, Lynn (White), her college roommate, and Toni (Jones), her childhood best friend. —Ryan Coleman, EW.com, 30 June 2025

And despite valid fears, the idea of marrying your best friend can, indeed, be a profound source of comfort. —Mark Travers, Forbes.com, 29 June 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