weather vane

American  

Or weathervane

noun

1. a device, as a rod to which a freely rotating pointer is attached, for indicating the direction of the wind.

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weather vane British  

noun

1. a vane designed to indicate the direction in which the wind is blowing

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Etymology

Origin of weather vane

First recorded in 1715–25

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Example Sentences

See Examples For:

weather vane

The Nvidia-backed compute provider has become a weather vane for one of the riskiest—and most highly leveraged—corners of the AI trade.

From The Wall Street Journal ● Oct. 15, 2026

The remarks by Williams are especially important because he is a top ally of Fed Chair Jerome Powell and is seen as a weather vane for the bank’s future moves.

From MarketWatch ● Mar. 3, 2026

Election betting is not so much a weather vane as a mechanism for bettors to reflect the world as they see it, and make or lose money doing so.

From Slate ● Dec. 10, 2025

A museum should not change directions like a weather vane but give us the reassurance that some things are timeless and provide us with the history and progression of art.

From Los Angeles Times ● Jun. 2, 2023

“Yes, a porch. And I’d love to have a weather vane on the roof.”

From "On the Far Side of the Mountain" by Jean Craighead George

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