Learn what "i don't want you to ruin the surprise" means, when people say it, and how to use it naturally in English.

It means the speaker wants the other person to keep something secret so the surprise stays secret.
From Duty Or Desire, Episode 25
Someone is asking another person not to spoil a surprise.
Use this when planning a surprise party, gift, or announcement. It can sound firm if you want to stress secrecy.
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