Definition of "airtight" in English

adjective

1. Impermeable to air or other gases.

2. (figuratively) Having no weak points or flaws.

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

3. (figuratively, of a person) Highly reserved in some matter, particularly tight-lipped or tight-fisted.

   • when Roger asked for $100 to take the preliminary steps to establish his claim, Mike yelled like a Hebrew auctioneer, for he was air-tight and squeezed a dollar until the woman on it yelled.
   • He was ‘air-tight,’ close-mouthed, and had but few confidants or intimate friends, but numerous acquaintances.

4. (figuratively, pornography, of a person) Triply penetrated simultaneously in the vagina, anus and mouth.