The phrase "to earn a doctorate" means the process of completing advanced studies and research in a specific field, leading to the attainment of a doctoral degree. Full definition
Many individuals who have earned a doctorate in education work in a leadership role in school administration in positions like school superintendent, principal, or curriculum coordinator. (teachercertificationdegrees.com)
Those who want to teach at the college level or conduct research must earn a doctorate degree in animal behavior, as well as postdoctoral training in the field. (learnhowtobecome.org)
It took him 7 years after earning his doctorate to land even a contingent post. (sciencemag.org)