Usage Note
Sécu is informal shorthand for la Sécurité sociale, France's national health and social insurance system. Most French residents are automatically affiliated and receive a carte Vitale (green chip card) to claim reimbursements. The term is ubiquitous in everyday speech and completely natural in non-formal contexts.
Examples
"La sécu rembourse une partie des frais."
Natural Translation
Social security reimburses part of the costs.

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