Why do Russians believe it's bad luck to shake hands across a threshold?

Explanation:

Shaking hands across a threshold is a cultural belief in Russia linked to traditions and superstitions. The Russians have a folkway that it is unlucky to shake hands through the doorway of a house. It is part of a broad spectrum of cultural behaviors and etiquettes that vary from region to region. Traditionally, the threshold of a home is considered to hold special significance, potentially acting as a boundary between the outside world and the sanctity of the home, and crossing this boundary with a gesture such as a handshake could be seen as contaminating or disrespectful.

Understanding such cultural nuances is essential in a professional context to convey respect and awareness of different cultural practices. In modern times, especially post-2020, shaking hands has become less common globally due to health concerns related to COVID-19, and alternatives like a wave, a nod, or a smile have become acceptable substitutes. These new developments reflect a changing landscape in interpersonal and intercultural communication and professional etiquette.