Simple past tense and past participle of plateau.(verb)
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Use "plateaued" in a sentence
"Oh, we don't mean her music one, that one is still vibrant as the term plateaued will allow."
"Seeking to derail the first of three suits filed by women alleging discrimination, a Fresno State attorney told jurors Monday that former volleyball coach Lindy Vivas was fired because her team had "plateaued" -- not because Vivas pushed hard for women's athletics or was rumored to be a lesbian."
"'The rate has plateaued, which is what particular people said in the past that it would do without kerbside.'"