death clock

death clock (plural death clocks)

1. A metaphorical clock representing when one is expected to die, e.g. when someone expects to have a short lifespan because of an illness.
   • 2012, Michel Bruneau, The Emancipating Death of a Boring Engineer

     Keene had a death clock running, counting the days before his final breath, and his work plan was set to meet that last deadline, with a typical project management rigor.

2. (humorous) Any of various websites that attempt to calculate when a person will die, based on calculations from their personal information (date of birth, whether they smoke, etc.).