What does the word contaminate mean?

Usage examples for contaminate

  1. Thou wilt surely not contaminate thy lips by speaking to a common beggar who cries aloud in the streets for bread. – The Atlantic Book of Modern Plays by Various
  2. And I would even take him on at the farm later, when I should no longer have cause to fear that he might contaminate my people. – Fruitfulness Fecondite by Emile Zola