from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The enlargement of a mould caused by rapping the pattern.
from the GNU version of the Collaborative International Dictionary of English
- n. The enlargement of a mold caused by rapping the pattern.
from The 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.
rap + -age (Wiktionary)
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