When I tried to point out that one swallow doesn't make a summer, and that one heavy snowfall isn't (another) final nail in the coffin of global warming, I got a «You are not authorized to access this server» error message from the Site That Doesn't Ban Commentary. (tamino.wordpress.com)
Scientific confirmation that spending time with your smartphones late at night is contributing to a national epidemic of undersleep might be the final nail in the coffin for your evening email or text habit, but Johnson is hardly the first to urge entrepreneurs and others to put down their phones in the evenings. (inc.com)
Still, Hitler's death signaled the final nail in the coffin for the Axis Powers in World War II. (businessinsider.com)