[keep] a secret
1
to refrain from revealing confidential or sensitive information to others
- I promise to keep your secret; I won't tell anyone about it.
- Can you trust him to keep our project plans a secret until the official announcement?
- She knows how to keep a secret and never gossips about others.
- Keeping a secret is a sign of loyalty and trustworthiness.
- He couldn't keep the secret any longer and eventually shared it with his best friend.