Definition of a leopard can't change his spots in English:

a leopard can't change his spots

phrase

proverb
  • People can't change their basic nature.

    ‘they saw him as an opportunist who was capable of changing his spots at any moment’
    • ‘There are, of course, going to be a number of people who are going to say that if we was really serious, he would has said all this months ago, a leopard can't change his spots, etc.’