replacing

noun
  1. The act of putting something new in the place of something else that is old, broken, or no longer suitable. noun
    The company is replacing outdated equipment with new technology.
    She is replacing the old curtains with new ones.
  2. To take the place of something or someone, or to put something or someone in the place of something or someone else. verb
    He is replacing the manager who retired last month.
    The teacher is replacing the broken chairs in the classroom.