It is an ill bird that defiles its own nest.

Meaning: Betraying your family or community harms the very foundation of your own security and belonging.

Origin: Recorded in A Dictionary of English Proverbs and Proverbial Phrases, an undated collection published in London by Whittaker & Co. around 1880 and credited to Thomas Preston. Its earlier history hasn't been traced.

Equivalents in French, Spanish, and German

  • French: Il faut laver son linge sale en famille (literally: One should wash one's dirty linen within the family)
  • Spanish: Aquella ave es mala, que en su nido caga (literally: It is an ill bird that fouls its own nest)
  • German: Es ist ein schlechter Vogel, der sein eigenes Nest beschmutzt (literally: It is a bad bird that dirties its own nest)

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