خالد خلّى خلال خاله في الخلاء. (Khālid khallā khalāl khālih fī al-khalāʾ.)
Meaning: A rapid-fire 'kh' (خ) drill — the throaty fricative that non-Arabic speakers find uniquely difficult.
Language: Arabic
Literally: Khalid left his uncle's cucumber / space in the open.
Category: Tricky
Origin: A popular modern Arabic tongue twister used in pronunciation classes across the Arab world.
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