Kiss of Death
1) Something that is ultimately ruinous, destructive, or fatal.
2) An action or relationship that is ultimately ruinous. For example, Some regard a royal divorce as a kiss of death to the monarchy. This term alludes to the betrayal of Jesus by Judas Iscariot, who kissed him as a way of identifying him to the soldiers who came to arrest him (Matthew 26: 47-49). It dates only from about 1940 but was previously called a Judas kiss.
3) When the nurse at the neurologist’s office last week says, “Have a great summer, and we’ll see you in November” as I am departing the doctor’s office.