|kiss of death|
|an act or relationship that has fatal or disastrous consequences|
|[from Judas' kiss that betrayed Jesus in the garden of Gethsemane (Mark 14:44--45)]|
kiss of death
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.