This means being too concerned about things that are not your business might cause problems.

VOA: special.2009.09.27

When things go wrong in a business, an employer may get angry.

VOA: special.2010.07.25

"But because there is no wood, we've left the salt business for other things.

VOA: standard.2010.03.29

"There was a recent story about wanting to, on Valentine's Day, raid people having romantic candlelit dinners, Muslim couples having romantic candlelit,I mean, what business of it is theirs and really don't they have better things to do?

VOA: standard.2010.02.24