alterar

verb
  1. to change or modify something, often slightly, from its original form or state. verb
    The tailor had to alterar the dress to fit the customer perfectly.
    They decided to alterar the recipe by adding more spices.
  2. to disturb or upset someone, causing them to feel uneasy or agitated. verb
    The unexpected news seemed to alterar her calm demeanor.
    His rude comments did not fail to alterar the peaceful atmosphere of the meeting.