n the 1946 film The Big Sleep, based on the Raymond Chandler mystery of the same name, Carmen—the promiscuous, drug-addicted younger sister of Lauren Bacall’s character—sizes up Philip Marlowe, played by Humphrey Bogart, and asks him, “What are you, a prizefighter?” Bogart responds, “No, I’m a shamus.” “What’s a shamus?” she inquires. “It’s a private detective,” he answers. Yes, Bogart is using the Yiddish version—more popularly spelled “shammes”—of the Hebrew word, “shamash.”