air pocket
n
1 a localized region of low air density or a descending air current, causing an aircraft to suffer an abrupt decrease in height
2 any pocket of air that prevents the flow of a liquid or gas, as in a pipe
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"