Airtight

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wiktionary

ref 

air +‎  tight


etymonline

ref

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.

取自“https://www.bigphysics.org/index.php?title=Airtight&oldid=34902”