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Cotton On

"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)


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



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