rear/raise its head

rear its (ugly) head

Of a difficult, unpleasant problem, to present itself and force people to deal with it. Fundamentalist extremism has been rearing its head all around the world over the last couple years. I can't believe tax day is already rearing its ugly head again.
See also: head, rear

rear its head

or

raise its head

COMMON If something unpleasant rears its head or raises its head, it starts to appear or be active, often when it had stopped or been hidden for a period. Now the same ugly forces of racial hatred are beginning to rear their heads again. The familiar pattern of violence is raising its head once again in the region. Note: People often say that something unpleasant rears or raises its ugly head. We will not allow hooliganism to rear its ugly head again.
See also: head, rear

rear its (ugly) head

(of an unpleasant matter) emerge; present itself.
See also: head, rear

rear/raise its (ugly) ˈhead

(used of something considered unpleasant) appear again after being hidden or forgotten: Political corruption has reared its ugly head again.Famine has raised its head again in many parts of the world.
See also: head, raise, rear