For want of a nail the shoe is lost; for want of a shoe the horse is lost; for want of a horse the rider is lost.

Meaning: Small negligences compound catastrophically; ignoring minor problems cascades into complete failure.

Origin: George Herbert's Outlandish Proverbs (1640) records this chain, and Benjamin Franklin repeated it in Poor Richard's Almanack, adding that for want of care about a horseshoe nail, a battle may be lost. The idea is much older, going back to medieval verse: small neglect leads, step by step, to disaster.

Equivalents in French, Spanish, Japanese, and German

  • French: Faute d'un point, Martin perdit son âne (literally: For want of a dot, Martin lost his donkey)
  • Spanish: Por un punto se pierde un zapato (literally: For want of a nail the shoe is lost)
  • Japanese: 千丈の堤も蟻の一穴から (Senjō no tsutsumi mo ari no ikketsu kara) (literally: Even a thousand-fathom dyke collapses from a single ant hole)
  • German: Kleine Ursachen, große Wirkungen (literally: Small causes, great effects)

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