the penny drops
idiom
British, informal
—used to say that someone finally understands something after not understanding it for a time
I had to explain it to him three times, but finally the penny dropped.
Dictionary Entries Near the penny drops
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“The penny drops.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/the%20penny%20drops. Accessed 25 Apr. 2024.
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