Brüderschaft
The  ( in German) or  () is a drinking ritual, or a rite of passage, to consolidate friendship. Two people simultaneously drink a glass of the same alcoholic beverage each, with their arms intertwined at the elbows. A "brotherly kiss" is customary after emptying the glasses, which then seals the ritual. Thence they are considered good friends and address each other informally. A symbolic act that establishes a closer bond between two—usually male—individuals, it has been associated with an end of formality between them and addressing each other  (the informal you in German) at least since Jus Potandi oder ZechRecht, a legal-parodic text published in 1616. In the 17th and 18th centuries, the expression  was also common, allegedly based on the assumption that "drinking together would bind and oblige". References

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Etiquette
Drinking culture
German traditions