buoy

1 of 2

noun

ˈbü-ē  ˈbȯi 

1

: float sense 2

especially, nautical : a floating object moored to the bottom to mark a channel or something (such as a shoal) lying under the water

swam out toward the buoy

2

: life buoy

Illustration of buoy

• buoy 1

buoy

2 of 2

verb

buoyed; buoying; buoys

transitive verb

1

: to mark by or as if by a float or buoy

buoy an anchor

2

a

: to keep afloat

a raft buoyed by empty oil drums

b

: support, uplift

… an economy buoyed by the dramatic postwar growth of industry …

—Time

3

: to raise the spirits of

—usually used with up

hope buoys him up

intransitive verb

: float

—usually used with up

They buoyed up like a cork.

Examples of buoy in a Sentence

Verb

The tax breaks should help to buoy the economy.

Recent Examples on the Web

Noun

One thing that’s sure is that the AMOC is definitely weakening, as troubling data from deep-ocean buoys shows crucial ocean currents slow at various points throughout the Atlantic. —Joe Wilkins, Futurism, 10 June 2026

One lifeguard sprinted to the end of the pier, dove into the water and kept the victim afloat with a rescue buoy until more help arrived. —Kristen Taketa, San Diego Union-Tribune, 8 June 2026

Verb

Fans decked out in Knicks merchandise filled the streets, subways and office towers with a sea of blue and orange, often fist-pumping strangers with all feeling buoyed by the Knicks pinch-me moments on the march to the championship prize. —Sportico Staff, Sportico.com, 14 June 2026

But shares of Tesla have also been buoyed by moonshot ventures like self-driving taxis and humanoid robotics. —Max Zahn, ABC News, 12 June 2026

Word History

Etymology

Noun and Verb

Middle English boye, probably from Middle Dutch boeye; akin to Old High German bouhhan sign — more at beacon

First Known Use

Noun

13th century, in the meaning defined at sense 1

Verb

1596, in the meaning defined at transitive sense 1

Phrases Containing buoy

• bell buoy
• breeches buoy
• life buoy

Rhymes for buoy

• chewy
• dewy
• gooey
• cestui
• ennui

Kids Definition

buoy

1 of 2 noun

ˈbü-ē  ˈbȯi 

1

: a floating object anchored in a body of water to mark a channel or warn of danger

2

: life buoy

buoy

2 of 2 verb

1

: to keep from sinking : keep afloat

2

: to brighten the mood of

the news buoyed him up