stamp + -est <span class="searchmatch">stampest</span> (archaic) second-person singular simple present indicative of stamp...
past tense 1st-person singular stamp stamped 2nd-person singular stamp, <span class="searchmatch">stampest</span>† stamped, stampedst† 3rd-person singular stamps, stampeth† stamped plural...
tense past tense 1st-person singular stampe stamped 2nd-person singular <span class="searchmatch">stampest</span> stampedest 3rd-person singular stampeth stamped subjunctive singular stampe...