big business
noun [U] informal COMMERCEDefinition
› large and powerful businesses and organizations that have a lot of influence, considered as a group: Investors and big business have put their money behind green energy.
› something that makes a lot of money: be big business for sb Multi-player games are big business for the company. Recycling has become big business.
(Definition of big business noun from the Cambridge Business English Dictionary
© Cambridge University Press)
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