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нелетная погода stresses
avia.	bird-walking weather (zdra)
нелётная погода
gen.	zero-zero weather
avia.	nonflying weather; dud weather (MichaelBurov)
jarg.	dud
Makarov.	non-flying weather
meteorol.	unflyable weather
mil., BrE, inf.	clampers
torped.	weather unfit for flying
vulg.	shit and corruption

нелётная погода: 1 phrase in 1 subject

Aviation

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