dilate

/ˈdaɪleɪt/
verb
  1. To become wider, larger, or more open.
    • The pupils of your eyes dilate when you enter a dark room.
    • The blood vessels dilate to increase blood flow when you exercise.
    • During labor, a woman's cervix dilates to allow the baby to pass through.
  2. To cause something to become wider or more open.
    • The medication helps dilate the airways, making it easier to breathe.
    • The eye doctor used special drops to dilate my pupils for the exam.
    • Warm temperatures can dilate the pores on your skin.
  3. To speak or write about something in great detail; to expand on a topic.
    • The professor began to dilate on the history of the Roman Empire.
    • She didn't need to dilate further; everyone understood her point.
    • In his speech, he dilated upon the importance of community service.