cobbler, keep to your last
English

Wooden lasts.
Alternative forms
Etymology
Related to the Latin phrase Sutor, ne ultra crepidam. A last is a tool for shaping shoes.
Proverb
- (idiomatic) Do not criticise matters outside your field of expertise; mind your own business.
Translations
do not criticise matters outside your field of expertise
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Further reading
ultracrepidarianism on Wikipedia.Wikipedia
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