The shoemaker's son always goes barefoot. 
Related proverbs
Similar proverbs in the same language
English
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None worse shod than the shoemaker's wife.
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None worse shod than the shoemaker's wife and the smith's mare.
Similar proverbs in another language
French
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Les cordonniers sont toujours les plus mal chaussés.
Shoemakers are always the worst shod.
German
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Der Schuster trägt immer die schlechtesten Stiefel.
The cobbler always wears the worst boots.
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Die Frau des Schusters hat selten ganze Schuhe.
The cobbler's wife rarely has whole shoes.
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Der Schuster hat die schlimmsten Schuhe.
The cobbler has the worst shoes.
Czech
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Kovářova kobyla a ševcova žena chodějí bosy.
The blacksmith's mare and the shoemaker's wife walk barefoot.
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Nejhorší boty u ševce.
Worst shoes at the cobbler's.
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Ševcovy boty nejhorší.
Shoemaker's shoes, the worst.