grande épreuve
/ˌɡrɒnd eɪˈprəːv/(also grande epreuve)
noun
A major World Championship motor race; especially the long-established Grands Prix races which have priority in fixing the international motor racing calendar.
Origin
1940s; earliest use found in The Times. From French grande épreuve, lit. ‘great test’ from grande, feminine of grand + épreuve.