n.
      - a person's regular occupation or trade. ▸work to be done or matters to be attended to. 
- a person's concern.
- commercial activity. ▸a commercial organization. 
- informal a matter:![]()  the business of trying to find her mother. 
- Theatre  actions other than dialogue in a play.
- 
(the business)
 Brit. informal an excellent person or thing.
Phrase
  
    - in business
 informal able to begin something.
- in the business of
 engaged in or prepared to engage in.
- like nobody's business
 informal extraordinarily.
- send someone about their business
 dated tell someone to go away.
 
  Etymology
  OE bisignis ‘anxiety’ (see busy, -ness); sense 2 dates from ME and is the root of current senses.