a question mark hangs over somebody/something

question mark over

An element of doubt surrounding the quality, ability, or future of (something). If we don't secure new funding soon, there is going to be a question mark over the future of this agency. The recent media coverage of the scandal has left a question mark over whether he should remain CEO of the company.
See also: mark, over, question
Farlex Dictionary of Idioms.

a ˈquestion mark hangs over somebody/something

,

there’s a ˈquestion mark (hanging) over somebody/something

there is some doubt about somebody/something: A question mark hangs over the future of this club. There’s a question mark over his loyalty to the company.
See also: hang, mark, over, question, somebody, something
Farlex Partner Idioms Dictionary
See also:
  • question mark over
  • anything in it
  • anything/nothing/something in it
  • boil (something) down to (something)
  • boil down to
  • boil down to something
  • it all boils down to
  • in (one's) element
  • in element
  • in your element