Airtight means completely sealed so that air cannot get in or out. It can describe something like a container, a room, or a lid that does not let air pass through.
People also use airtight in a more general way to mean something is very secure, complete, or hard to argue against. For example, an “airtight plan” is one with no obvious problems, and an “airtight excuse” is one that seems impossible to question.
Meaning & Usage
In daily life, airtight is often used for boxes, jars, bags, or seals that keep food fresh. You may also hear it in conversations about plans, arguments, or rules when something is so solid that it leaves no room for doubt.
Examples
“Put the cookies in an airtight container.”
“The lawyer gave an airtight argument.”
“We need an airtight plan before we start.”
What does airtight mean in cooking?
In cooking, it means a container or seal that keeps air out, helping food stay fresh for longer.
Can airtight be used for ideas or plans?
Yes. It can mean a plan, excuse, or argument is very strong and has no clear weaknesses.
Is airtight always about air?
No. It often refers to air, but people also use it to mean something is very secure or complete.
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