the penny drops

US /ðə ˈpɛni drɑps/
UK /ðə ˈpɛni drɑps/
"the penny drops" picture
1.

فهم الأمر, استوعب الفكرة

used to say that someone has finally understood something, especially after a period of not understanding

:
It took him a while, but then the penny dropped and he realized his mistake.
استغرق الأمر بعض الوقت، ولكن بعد ذلك فهم الأمر وأدرك خطأه.
I kept explaining, but it wasn't until I drew a diagram that the penny dropped.
واصلت الشرح، ولكن لم يفهم الأمر إلا عندما رسمت رسمًا بيانيًا.