Rap, v. t. 1. To strike with a quick blow; to knock on.
With one great peal they rap the door. Prior.
2. (Founding) To free (a pattern) in a mold by light blows on the pattern, so as to facilitate its removal.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.