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Cotton On

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The Harry Potter Canon

"Why don't you show Harry where he's sleeping, Ron?" said Hermione from the doorway.
"He knows where he's sleeping," said Ron, "in my room, he slept there last -"
"We can all go," said Hermione pointedly.
"Oh," said Ron, cottoning on. "Right."
- Hermione and Ron (GF5)

Definition

U.S.: “catch on”, “get it”, understand.

 

Commentary

Tags: British