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not worth a tinker's damn
not worth a tinker's damn или not worth a tinker's dam {adj. phr.}, {informal}
Ничего не стоящий; бесполезный.
As a bricklayer he was not worth a tinker's damn.
I am not familiar with the subject so my opinion would not be worth a tinker's dam.
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Источник: A Dictionary of American Idioms
