Airtight meaning

ârtīt
Impermeable by air.
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Having no weak points; sound.

An airtight excuse.

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Too tight for air or gas to enter or escape.
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Having no flaws or weaknesses.

An airtight alibi.

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Giving no opening for attack; invulnerable.

An airtight defense.

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Being impermeable to air or other gases.
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(figuratively) Having no weak points or flaws.

We have an airtight argument they won’t be able to punch holes in.

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(figuratively, of a person) Highly reserved in some matter, particularly tight-lipped or tight-fisted.
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Alternative form of airtight.
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Origin of airtight