Meaning of “air pocket” in the English Dictionary

british dictionary

"air pocket" in British English

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air pocketnoun [ C ]

uk /ˈeə ˌpɒk.ɪt/ us /ˈer ˌpɑː.kɪt/

an area in the sky where the air is flowing differently from the way it is in the surrounding parts. Air pockets can sometimes cause aircraft to go up or down suddenly.

(Definition of “air pocket” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)