plateau
noun [ S ]
uk/ˈplætəʊ/ us/plæˈtəʊ/a level beyond which business activities, sales, profits, etc. no longer develop or increase, especially after a period of rapid growth:
reach/hit a plateau Do you believe that the number of people using the internet has now reached a plateau?
plateau
verb [ I ]
uk/ˈplætəʊ/ us/plæˈtəʊ/to stop developing or increasing, especially after a period of rapid growth:
Analysts believe the market will plateau within the next five years in line with demographic trends.
start/begin to plateau Sales of new cars have begun to plateau after three years of record growth.