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Tinker's dam. A tinker's dam is a temporary patch to repair a hole in a metal vessel such as a pot or a pan. It was used by tinkers and was usually made of mud or clay, or sometimes other materials at hand, such as wet paper. The material was built up around the outside of the hole, so as to plug it.
not give a tinker's damn. Fig. not to care at all. (A tinker's damn or dam may be a worthless curse from a tinker or a small dam or barrier used to contain molten metal.) I don't give a tinker's damn whether you go or not! See also: damn, give, not.