Longman Dictionary of Contemporary English homepage

question mark

 noun
     
Related topics: Letters and punctuation
question mark [countable]
1SLA the mark (?) that is used at the end of a question
2

there is a question mark over something/a question mark hangs over something

used to say that there is a possibility that something will not be successful or will not continue to exist:
A big question mark hangs over the company's future.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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