Seal (one's) fate verb phrase
If you say an event or situation seals your fate, you mean that some unpleasant things will certainly happen to you.
From the moment I got in the car, my fate was sealed.
Jane failed the entrance exam, which sealed his fate and deprived him of entering university.
His bad decision sealed our fate.
Everything happens the way it should, especially bad things and there's nothing you can do and no reason to be sad about it.
Used to say that something is destined to happen
The verb "seal" should be conjugated according to its tense.