The idiom "the penny drops" is believed to have originated from the concept of old mechanical slot machines or coin-operated devices. In such machines, a penny or coin would physically drop into a slot or mechanism to activate or unlock a particular outcome. The phrase represents the moment when the coin drops and triggers a realization or understanding in a person's mind. It is commonly used when someone finally comprehends a concept, recognizes the truth about a situation, or perceives the implications of a statement or action.

What is the origin of the idiom "the penny drops" and when to use it?

Définition et signification de « the penny drop » en anglais

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