What does buddy mean?
"Buddy" is an informal English word for a close friend or companion, most strongly associated with American speech though now common everywhere English is spoken. It carries a warm, casual, egalitarian tone: a buddy is someone you spend time with, confide in, or team up with, whether on a road trip, at the gym, or in a shared project. The word also has a practical side — the "buddy system," in which people pair off to watch out for each other's safety while swimming, hiking, or diving, is built directly on this sense. Used as a direct address toward a stranger, however, it can flip from friendly to brusque or even confrontational, so context shapes its feel considerably. The word first appeared in American English in the nineteenth century, likely as an altered form of "brother" or related to the dialect word "butty," meaning workmate. Its enduring popularity reflects a cultural fondness for easygoing camaraderie over formal friendship.
A close friend or companion.
"My old college buddies are flying in for the reunion."
Informal and affectionate in register.
To become friendly with or pair off with someone (usually as "buddy up" or "buddy around").
"The teacher had the kids buddy up before the field trip."
Almost always used in the phrasal forms "buddy up" or "buddy around."
The standard plural simply adds -ies after the final y.
"They've been buddies since kindergarten."
"Buddy" is barely 150 years old, yet it has already spawned everything from the buddy cop movie to the safety rule every schoolchild knows: never swim without your buddy.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of buddy
"Buddy" originated in American English in the mid-nineteenth century. Its exact source is uncertain, but lexicographers generally link it either to an altered pronunciation of "brother" or to the older British dialect word "butty," meaning a workmate or companion, which itself may derive from "booty" in the sense of shared spoils. The verb "to buddy up" developed later from the noun. It remains chiefly informal and is especially characteristic of American usage.
Related word forms
How buddy is actually used
"Buddy" is distinctly informal and warm in tone. When used as a direct address between strangers ("Listen, buddy…"), it can sound condescending or aggressive rather than friendly, so register matters. It is common throughout American English and widely understood elsewhere, though "mate" plays the equivalent role in British English.
Easily confused with buddy
"Body" refers to a physical person's form or a corpse, while "buddy" refers to a friend — the two words rhyme but share no meaning.
"Bud" is an informal shortening of "buddy" meaning a close friend, but it also literally means a flower's undeveloped shoot, whereas "buddy" has only the friendship sense.