take the plunge
US /teɪk ðə plʌndʒ/
UK /teɪk ðə plʌndʒ/

1.
dar o grande passo, tomar a decisão
to decide to do something important or difficult that you have been thinking about for a long time
:
•
After years of deliberation, they finally decided to take the plunge and buy a house.
Depois de anos de deliberação, eles finalmente decidiram dar o grande passo e comprar uma casa.
•
She was nervous, but she knew it was time to take the plunge and start her own business.
Ela estava nervosa, mas sabia que era hora de dar o grande passo e iniciar seu próprio negócio.