to become greater in size, number or importance; to make something greater in size, number or importance

if a business expands or is expanded, new branches are opened, it makes more money, etc.

The organic market is rapidly expanding among middle-class shoppers.

They have recently expanded into the Middle East.

We've expanded the business by opening two more stores.

The company is planning to expand its American operations.

to talk more; to add details to what you are saying

I repeated the question and waited for her to expand.

LEARNit Dictionary