the penny drops
US /ðə ˈpɛni drɑps/
UK /ðə ˈpɛni drɑps/
1.
capire finalmente, realizzare
used to say that someone has finally understood something, especially after a period of not understanding
:
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It took him a while, but then the penny dropped and he realized his mistake.
Ci è voluto un po', ma poi ha capito e ha realizzato il suo errore.
•
I kept explaining, but it wasn't until I drew a diagram that the penny dropped.
Ho continuato a spiegare, ma solo quando ho disegnato un diagramma ha capito.