seal fate

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seal (one's) fate

To solidify or confirm that a particular, usually unpleasant, thing will happen. If you fail this exam, it will seal your fate and make your GPA low enough to qualify for expulsion.
See also: fate, seal

seal someone's fate

Fig. to determine finally the fate of someone. His lying and cheating sealed his fate. He was convicted and sent to prison.
See also: fate, seal