guten Rutsch

Etymology
lit. 'good slide', suggesting one slides into the new year.

An alternative suggestion is that it derives from, clipped from. (Compare, said to be from a Yiddish phrase.)

Phrase

 * 1) happy New Year
 * 2) * 2022 December 31, Steffen Gierescher, "Einen guten Rutsch für unsere Leserschaft!" ("A happy New Year to our readership!"), Die Rheinpfalz.

Usage notes
Only used in the final days of December and up until midnight on New Year's Eve, after which other phrases such as are used.