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- "Both of you look as though you’ve had Stretching jinxes put on you. I swear Ron’s grown four inches since I last bought him school robes."
- —Mrs Weasley to Harry on the latter's height[src]
The Stretching Jinx (incantation unknown) is a jinx which increases the target's height. Molly Weasley remarked in 1996 that recent growth spurts had made her son Ron and his friend, Harry Potter, look as if this spell had been cast upon them both.
- Harry Potter and the Half-Blood Prince (Mentioned only)