airtight

air|tight /'eərtaɪt/
also air-tight
1 [ADJ]
If a container is airtight, its lid fits so tightly that no air can get in or out.
Store the cookies in an airtight tin.
2 [ADJ]
An airtight alibi, case, argument, or agreement is one that has been so carefully put together that nobody will be able to find a fault in it. (AM; in BRIT, use watertight)
Mick had an airtight alibi.

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