Usage Note
Bousiller is a colloquial verb meaning to ruin or break something through carelessness. It is informal and slightly crude in register — il a bousillé mon téléphone means 'he trashed my phone.' In older French it also meant to do shoddy building work, giving a sense of sloppiness.
Examples
"Tu as bousillé le moteur."
Natural Translation
You've wrecked the engine.

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