Definition of “big business” - English Dictionary

“big business” in American English

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big businessnoun [ U ]

us /ˈbɪɡ ˈbɪz·nəs/

(Definition of “big business” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“big business” in Business English

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big businessnoun [ U ]

informal COMMERCE

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” from the Cambridge Business English Dictionary © Cambridge University Press)