Usage Note
Ruiner means to ruin financially or to spoil something. Se ruiner means 'to ruin oneself financially' or colloquially 'to spend a fortune'. The noun la ruine (f) means 'ruin' (financial or physical structure), and en ruine(s) means 'in ruins'.
Examples
"Ces dépenses vont nous ruiner."
Natural Translation
These expenses will ruin us.

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