contaminar

verb
  1. To make something impure or unsuitable by contact or mixture with something unclean, harmful, or undesirable. verb
    The factory was fined for contaminating the river with toxic waste.
    Improper disposal of chemicals can contaminate the soil and groundwater.
  2. To corrupt or infect by contact or association. verb
    His negative attitude began to contaminate the team's morale.
    The spread of misinformation can contaminate public discourse.