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Explanation: If they mean the car that insurance copanies give you when your car is being repaired after an insurance claim, then the usual name is courtesy car, at least in UK-EN.
Budget Car Insurance FAQ's
Your car insurance also applies to any courtesy car one of our recommended repairers provides to you while any damage to your car covered by our car ... www.budgetinsurance.com/.../Frequently-asked-questions/ Are-courtesy-cars-covered-by-my-car-insurance-policy/