polijsten

verb
  1. To polish or make smooth and shiny by rubbing or chemical action. verb
    He spent hours polijsten the silverware until it gleamed.
    The craftsman was skilled at polijsten marble sculptures to a high sheen.
  2. To refine or perfect something, such as a skill or piece of work. verb
    She continued to polijsten her language skills by practicing daily.
    The author spent months polijsten the manuscript before submitting it to the publisher.