rear its (ugly) head
US /rɪər ɪts (ˈʌɡli) hɛd/
UK /rɪər ɪts (ˈʌɡli) hɛd/

1.
refaire surface, pointer le bout de son nez
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.
L'ancienne rivalité entre les deux équipes a commencé à refaire surface.
•
Whenever we discuss money, his true colors rear their ugly head.
Chaque fois que nous discutons d'argent, sa vraie nature refait surface.