Meaning of the word "the penny drops" in English

What does "the penny drops" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the penny drops

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

Idiom

1.

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

Example:
It took him a while, but then the penny dropped and he realized his mistake.
I kept explaining, but it wasn't until I drew a diagram that the penny dropped.
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