"Grave Mistake": A serious and significant error with potentially severe consequences. خطای جدی و قابل توجه با عواقب بالقوه شدید.
تصمیم یا اقدامی بسیار بد که می تواند به نتایج وخیم منجر شود
مترادف: Serious error, major blunder, critical mistake
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مثال؛
Failing to back up his data was a grave mistake that led to the loss of important information.
It was a grave mistake to ignore the warnings about the financial crisis.
She realized that breaking the trust of her closest friends was a grave mistake.