noun
plural -nesses
[noncount] the activity of making, buying, or selling goods or providing services in exchange for money
work that is part of a job
the amount of activity that is done by a store, company, factory, etc.
[count] :an organization (such as a store, company, or factory) that makes, buys, or sells goods or provides services in exchange for money
[singular] :something that concerns a particular person, group, etc. :something that needs to be considered or dealt with
The phrase mind your own business is used as an informal and often somewhat impolite way to tell someone to stop watching or asking about something that is private.
To say that you were minding your own business when something happened means that you were doing what you normally do and were not bothering anyone.
If you say something is nobody's business, you mean that it is private and other people do not need to know about it.
Someone who has no business doing something has no right to do it.
[noncount] :something that must be done
[singular] :a matter, event, or situation - usually used after an adjective
business as usual
used to say that something is working or continuing in the normal or usual way
business is business
used to say that in order for a business to be successful it is necessary to do things that may hurt or upset people
in business
operating as a business
informal :ready to begin doing or using something
like nobody's business
informal :very well or quickly or in very large amounts
mean business
to be serious about doing something
out of business
closed down :no longer in business
the business
Brit slang :a very good or impressive person or thing