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это не моё дело stresses
gen.	it has nothing to do with me; it is no business of mine; it is off my beat altogether; it's not my funeral; is none of my business (Rust71); no concern of mine; it's no concern of mine; it is not my affair; that is not my concern; that's not my affair; it is not my job; it is no concern of mine; it is not my funeral; my withers are unwrung; this is no concern of mine
idiom.	it's none of my business (Acruxia); not my department (Alexander Oshis)
inf.	this isn't my fight (Technical); that's not my thing (Andrey Truhachev); it's not my thing (MichaelBurov)
Makarov.	it's no concern of mine; this is not in my bailiwick
slang	plead the fifth (a five)

это не моё дело: 2 phrases in 2 subjects

American usage, not spelling	1
Business	1