have been stamping
-he estado sellando
Present perfect progressiveconjugation ofstamp.There are other translations for this conjugation.

stamp

NOUN
(mail)-el sello
Synonyms for stamp
TRANSITIVE VERB
(to put a stamp on)-sellar
Synonyms for stamp
TRANSITIVE VERB
(to leave a mark on)-grabar
Synonyms for stamp
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to cast a spell on