rear its (ugly) head
US /rɪər ɪts (ˈʌɡli) hɛd/
UK /rɪər ɪts (ˈʌɡli) hɛd/
1.
if an unpleasant situation or problem rears its head, it appears or occurs, especially after being hidden or dormant for a period
:
•
The old rivalry between the two teams began to rear its ugly head again.
•
Whenever we discuss money, his true colors rear their ugly head.