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to keep a secret
01
to refrain from revealing confidential or sensitive information to others
例
John couldn't keep a secret and always ended up spilling the beans about surprises his friends had planned for others.
The spy knew that they couldn't trust anyone, since three may keep a secret if two are dead.
Keeping a secret is a sign of loyalty and trustworthiness.
I told him not to say anything, and he said his lips are sealed, so hopefully he'll be able to keep a secret this time.
She knows how to keep a secret and never gossips about others.
