Meaning of the word "reach a plateau" in English

What does "reach a plateau" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

reach a plateau

US /riːtʃ ə plæˈtoʊ/
UK /riːtʃ ə plætˈəʊ/

Idiom

to reach a stage where there is no more progress or improvement

Example:
After months of rapid growth, the company's sales began to reach a plateau.
My fitness progress seems to have reached a plateau; I'm not getting stronger anymore.