Century Dictionary and Cyclopedia
- n. In founding, excess in the size of a casting over the size of the pattern, due to the fact that the pattern has been rapped too hard when drawing it from the sand, so that the hole it left in the mold was larger than the pattern itself.
GNU Webster's 1913
- n. (Founding) The enlargement of a mold caused by rapping the pattern.
- rap + -age (Wiktionary)
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