This is a Latin phrase meaning "The fear of death disturbs me." It was often seen in late medieval/early Renaissance poetry.
The fear expressed is not so much of death itself but rather, of dying "unshriven," or without having confessed your sins. In Christian mythology, if you die with an unabsolved mortal sin, you get the express elevator to hell. With less serious sins, you have to spend a certain amount of time in Purgatory, a small town in Kentucky with lots of guns but no toilets.
Now, this makes Christians nervous in times of danger. So I'm wondering--can they still see a priest for confession now that churches are closed? If priests do make themselves available, how do they keep people apart as they wait for their confession session?
Italy is a very religious nation, so I'm wondering how they handle this problem there. For many people, access to a church is more important than access to food or water. What's the situation in Italy's Christian community?