Etymology
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airtight (adj.)

also air-tight, "impermeable to air," 1760, from air (n.1) + tight. Figurative sense of "incontrovertible" (of arguments, alibis, etc.) is from 1929.

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Definitions of airtight

airtight (adj.)
having no weak points;
an airtight defense
an airtight argument
Synonyms: air-tight
airtight (adj.)
not allowing air or gas to pass in or out;
Synonyms: air-tight / gas-tight
From wordnet.princeton.edu