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German word tschüss comes from Dutch and later Low German rendering of the French adieu (a dated form of "farewell" or "goodbye")
adieu (French)
(Southern France) hello. (dated) goodbye, see you soon. Farewell, adieu Farewell.
adjuusjes (Dutch)
adjuus (Dutch)
adjüs (Low German)
(in many dialects) bye
tschüss (German)
(informal) bye, cheers, ciao.