Dialogo alla fermata dell’autobus in città

What does “timbrare il biglietto” mean in Italian?

On Italian buses and trains, buying a ticket is just the first step. A paper ticket often has to be timbrato — slid into a small machine that stamps the date and time on it before your trip. Skip that step and an inspector can fine you, even though you paid. The verb comes from timbro, meaning a stamp or seal. Some modern tickets are valid the moment you buy them and need no stamp.

In the dialogue, a visitor about to board asks “Devo timbrarlo?” — “Do I have to stamp it?” The local answers no: a ticket bought from the machine on board (la macchinetta) is already valid for 90 minutes. Note that timbrarlo is just timbrare with “it” stuck on the end, so it means “stamp it.” Related words on station signs say the same thing: timbrare, convalidare and obliterare all mean “to validate,” and the orange box you push the ticket into is the obliteratrice. The noun timbro (a stamp or seal) came into Italian from French timbre, which traces back to a Greek word for a drum.