Also means
seal
Usage Note
Bollo is masculine: il bollo, i bolli. It most commonly refers to an official revenue stamp (marca da bollo) required on Italian administrative documents, or the vehicle ownership tax (bollo auto). Do not confuse bollo with francobollo ('postage stamp'), though they share the same root.
Examples
"Devi apporre un bollo sul modulo."
Natural Translation
You must put a stamp on the form.

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