kiss of death.
Famous people take heed: reciting your vows on camera can mean the kiss of death for a marriage.
Of course, this can be the kiss of death for people who have a hard time getting motivated.
Some people believe that cultural differences can be the kiss of death when it comes to relationships.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.