rear its (ugly) head

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