咄 (duō) is a classical Chinese interjection used to express disapproval, commiseration, or sudden surprise — roughly equivalent to 'tsk!' or 'tut!' in English. It appears in literary texts and set phrases like 咄咄逼人 (duō duō bī rén, 'overbearing; aggressive'). In Taiwan it is also pronounced duò. This word is rare in modern speech and mostly encountered in written or formal historical contexts.