Ciao means slave: the world's most Italian greeting began in Venice as a bow
The word comes from Venetian s'ciao, from late Latin sclavus: “I am your slave”, a reverential greeting. In the comedies of Carlo Goldoni the nobles of Venezia still take their leave with “vi sono schiavo”. From the 1800s the formula shortened into an informal salute; the lexicographer Niccolò Tommaseo noted in his dictionary, with some disapproval, that the habit was reaching Tuscany. Ciao only truly entered Italian in the 20th century, and emigration then carried it everywhere: tchau in Portuguese, chao in Spanish, tchao in French, tschau in German, nearly always to say goodbye. A servant's bow, worn light, that went around the world.
