What is the verb for quality?

There isn't one single verb that perfectly captures the meaning of "quality." It depends on the specific context of what you want to say.

Here are some options, along with examples:

* To assess/evaluate: "We need to assess the quality of the materials."

* To improve: "We are working to improve the quality of our products."

* To maintain: "The company strives to maintain high quality standards."

* To ensure: "Our team ensures the quality of all our services."

* To guarantee: "We guarantee the quality of our workmanship."

The best verb will depend on your intended meaning. Do you want to emphasize checking, improving, or ensuring the quality?