Category 1
To involve oneself in someone else’s situation
to make it one's business
An individual/your own problems
personal business
When companies compete by selling the same service/product
Business Competition
Something that could be negative if you get involved with it
Bad Business
the time when a business is open
Business hours/Office hours/Hours of operation
A yearly event where people do business or operate
Annual Business
When someone is playing/fooling around and not being serious
Monkey/funny business
For your business or company to not be open/functional
To be/go out of business
A business that is doing well or growing exponentially
Booming Business
To have a business open or to be working
To be in business
To do things as you normally do
Business as usual
To not involve your family/personal business in your work life
Don't mix business with pleasure
A conglomerate of business minds/individuals to promote a service/product
Business Corporation
To manipulate or try to do business that is shady or potentially illegal
Dirty Business
To be serious about what you are doing
To mean business
The task that you are focusing on at that moment
Business at hand
to keep to yourself, to not share your thoughts or plans with someone
To Mind One's Own Business
To add or improve certain aspects of your company
To build up business
to focus on a task that has become important
To get down to business
To not be involved/included with a certain field or business district
I'm out of the business