not allowing air to get in or out 密封的；不透气的 Store the cake in an airtight container. 把蛋糕存放在密封容器里。 🔊🔊 - (figurative)
an airtight alibi (= one that cannot be proved to be false) 无懈可击的不在犯罪现场的证据
Oxford Collocations DictionaryAirtight is used with these nouns:- container
- jar
- lid
- …