How can we use plateau in sentence as a verb?

You're right! "Plateau" is primarily a noun, but it can also function as a verb, meaning:

* To reach a level of stability after a period of growth or improvement.

Here are some examples:

* My weight loss plateaued after a few weeks.

* The company's profits have plateaued in recent months.

* His writing skills plateaued at a high level.

* The economy plateaued after a period of rapid growth.

You can also use "plateau out" to emphasize the idea of reaching a point where progress stops. For example:

* My fitness progress plateaued out after a year of training.

Remember, the verb "plateau" is usually used in a context where something has been progressing or improving, and then reaches a point where it stops growing or advancing.