What is "fric-frac"

Fric-Frac is a 1939 French comedy film directed by Claude Autant-Lara and Maurice Lehmann, starring Fernandel, Arletty and Michel Simon. It tells the story of Marcel, an assistant to a jeweller, who befriends a couple of criminals who want to use him as an accomplice to rob his boss. The film is based on a 1936 play by Édouard Bourdet. Filming took place in March and April 1939 at the Laboratoires et Studios Eclair in Épinay-sur-Seine. The film was released in France on 15 June 1939 through Solaris Distribution.