odliczanie przed startem rakiety po angielsku:

It's a final countdown.

The countdown to Brexit has officially begun.

The most exciting part of New Year's Eve is the countdown.

countdown /ˈkaʊntdaʊn; US / noun [countable] the act of saying numbers backwards to zero just before sth important happens

Take it seriously! The school festival won't wait for us. We're already in the final countdown.