Usage Note
Foirer is informal/colloquial, meaning a plan or attempt has failed or gone badly. Ça a foiré is a very common way to say 'it went pear-shaped'. It is stronger and more colorful than échouer (to fail) and belongs firmly to informal spoken French; avoid it in formal writing.
Examples
"Le projet a complètement foiré."
Natural Translation
The project completely fell apart.

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