the penny drops

(British & Australian)

if you say the penny drops, you mean that you have finally understood something It was only when I saw Ron's car outside Penny's house that the penny finally dropped and I realised they were having an affair.

See spend a penny

Common Names:

Name	Pronounced	Usage
Kiyoshi	kee-yo-shee	Japanese
Annice	AN-is	English
Zorana	-	Croatian, Serbian
Philomena	fil-ə-MEEN-ə (English)	English, German, Late Greek
Petrona	pe-TRO-nah	Spanish
Shukri	-	Arabic