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counterstamp

[noun koun-ter-stamp; verb koun-ter-stamp]
noun
  1. a stamp added to a stamped paper or document as a qualifying mark.
  2. Numismatics. countermark(def 1).
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verb (used with object)
  1. to stamp (a paper or document) already stamped.
  2. Numismatics. countermark(def 2).
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Origin of counterstamp

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018