an allen

on all

→ an
phrase Uncommon #18,580
on all Used with a plural noun; the exact translation of “an” depends on context and may be “at” or “on.”
GE: An allen Fenstern hängen Blumen.
EN: There are flowers on all the windows.

An allen Feiertagen, Ostern und Weihnachten.

On every public holiday, including Easter and Christmas.

— Cinema Paradiso (1988)

Tom plant, an allen Türen die Schlösser zu tauschen.

Tom plans to change the locks on all the doors.

Seine Mutter sollte an allen Mauern des Landes sein Bild sehen können.

His mother should be able to see his image on every wall in the country.

— Die Frau die singt - Incendies (2010)

Das Logo der Baufirma ist an allen Wohnungen, Mama.

The construction company's logo is on all the apartments, Mom.

— Aquarius (2016)

Die Freude der Soldaten an allen Fronten.

The joy of the soldiers on all fronts.

— Die Blechtrommel (1979)