question mark
ˈquestion mark
noun [countable]
1. 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.
ˈquestion mark
noun [countable]1. 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: