the penny dropped
B2CEFR level
35/100Rarity: fairly common
InformalRegister
The moment when someone finally understands something that had been puzzling them.
It was only when I saw the invoice that the penny dropped and I realised we'd been overcharged.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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