pla·teau
/ˈplæt.əʊ/ /plætˈoʊ/ noun ¹ a large flat area of land that is high above sea level noun ² a state of little or no change following a period of activity or progress. "the peace process had reached a plateau" verb reach a state of little or no change after a time of activity or progress. "the industry's problems have plateaued out"