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моё дело маленькое stresses
gen.	it is no concern of mine (Anglophile); it's none of my business; it is none of my business (Anglophile)
idiom.	my job is to obey (Taras); I'm just a little guy (Taras); it's not my place to get involved (Taras); it's none of my business (Taras); it's none of my concern (Taras); it has little to do with me (Taras); it has nothing to do with me (Taras); it's not my affair (Taras); it's not my business (Taras); that's not up to me (Taras); I have no place getting involved (Taras)
inf.	it is none of my business

моё дело маленькое: 1 phrase in 1 subject

Informal

1