toss-up

US /ˈtɑːs ʌp/
UK /ˈtɑːs ʌp/
"toss-up" picture
1.

pile ou face, situation incertaine, égalité

a situation in which either of two choices or results is equally possible and it is impossible to predict which will happen

:
It's a toss-up whether she'll get the job or not.
C'est un pile ou face de savoir si elle obtiendra le poste ou non.
The election is a real toss-up between the two main candidates.
L'élection est un véritable pile ou face entre les deux principaux candidats.