airtight

adjective4

1. •
   Impermeable to air or other gases.

   • Tupperware founder Earl Tupper in 1946 introduced its plastic products to the public, and subsequently patented their flexible airtight seal. — 2024
2. •
   (figurative) Having no weak points or flaws.

   • We have an airtight argument they won’t be able to punch holes in.
   • airtight will
3. •
   (figurative) 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. — 1908
4. •
   (slang, figurative) Triply penetrated simultaneously in the vagina, anus and mouth.