tinker-dam

tinker's dam

noun
2.
(in plumbing) a barrier for retaining molten solder within a certain area until it has cooled.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
tinker's dam

noun
something of little value; "his promise is not worth a damn"; "not worth one red cent"; "not worth shucks" [syn: damn
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Tinker-dam is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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