toss-up
US /ˈtɑːs ʌp/
UK /ˈtɑːs ʌp/

1.
niewiadoma, pięćdziesiąt na pięćdziesiąt, remis
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.
To niewiadoma, czy dostanie tę pracę, czy nie.
•
The election is a real toss-up between the two main candidates.
Wybory to prawdziwa niewiadoma między dwoma głównymi kandydatami.