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English definition of “question mark”

question mark

noun    
[C, usually singular] a feeling of doubt about something: a question mark over/about sth There is a big question mark over people's willingness to invest in this scheme. The biggest question mark hanging over China's exports lies in the currency exchange rate.
[C] MARKETING a product or company that has a small share of a market that is growing very fast: If nothing is done to change the market share, question marks will just absorb large amounts of cash. → See also cash cow, dog, star noun
(Definition of question mark noun from the Cambridge Business English Dictionary © Cambridge University Press)
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