airtight (comparative more airtight, superlative most airtight)
- Being impermeable to air or other gases.
- (figuratively) Having no weak points or flaws.
- We have an airtight argument they won’t be able to punch holes in.
- (figuratively, of a person) Highly reserved in some matter, particularly tight-lipped or tight-fisted.
- 1908, The Plumbers Trade Journal, Plumbers’ Trade Journal Publishing Company, volume 44:
- 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.
- 1915 April, Annals of Iowa, Historical Department of Iowa, series 3, volume 12, page 599:
- He was ‘air-tight,’ close-mouthed, and had but few confidants or intimate friends, but numerous acquaintances.
being impermeable to air or other gases
having no weak points or flaws