misstamp /ˈmɪs.stæmp/noun 1/mɪsˈstæmp/ verb 1forms 3 noun1 •A stamp applied incorrectly.According to plaintiff, the misstamp "could have been a factory error." — 1997 misstamp /mɪsˈstæmp/ verb1 •To stamp incorrectly.This procedure will serve to eliminate claims that Customs misstamped the date of presentation, an allegation often made in one-day late cases. — 1986 formsmisstamped · misstamping · misstamps