
plateau
plateaued
Describes a state of stagnation or standstill after a phase of change or growth. In German, the word is used adjectivally in this form, although this is grammatically unusual and is often considered an Anglicism.
Nach dem schnellen Anstieg sind die Verkaufszahlen jetzt seit drei Monaten plateau.
After the rapid increase, sales figures have now plateaued for three months.