Buddy (noun)

1. A friend or companion.
2. A partner in a work relationship.

Origin:

Buddy is a term that originates from the united states in the late 19th century. it is a shortened form of the word "brother", used as a term of endearment between friends. .

Examples:

1. I've known my buddy since grade school.
2. He'll be my buddy on this project.
3. I'm going to the concert with my best buddy.
4. My buddy and I always have each other's back.
5. He's more than just a buddy, he's a brother.