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Air pocket

(not in technical use) a nearly vertical air current that can cause an aircraft to experience a sudden change in altitude, usually a decrease.
Historical Examples

No; if it had been compressible you would not have had that exhibition at the air pocket.
The Wonder Island Boys: Exploring the Island Roger Thompson Finlay

True enough; it was an air pocket which extended in about fifty feet, and had no passageway beyond.
The Wonder Island Boys: Exploring the Island Roger Thompson Finlay

air pocket—A local movement or condition of the air causing an aeroplane to drop or lose its correct attitude.
The Aeroplane Speaks H. Barber

a localized region of low air density or a descending air current, causing an aircraft to suffer an abrupt decrease in height
any pocket of air that prevents the flow of a liquid or gas, as in a pipe


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