noun
a long, narrow, tapered tube used to indicate wind direction and speed
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The airport uses wind socks to determine wind direction for incoming and outgoing flights.
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I always look at the wind sock by the beach to see if it's a good day for kite flying.
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Hey, check out that wind sock over there, it's spinning like crazy!
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Her mood was like a wind sock, constantly changing with the slightest breeze.