Can you keep a secret?
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asked before disclosing a secret to make sure the recipient can be trusted not to tell it to other people
Just between you and me...
phrase

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used to express that the information being discussed should not be shared with other people
I told you that in confidence.
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said when you believed that the person you spoke to won't leak or disclose the information you shared with them
Don't say a word to anyone. / Not a word to anyone.
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a plea or command that means `don't reveal this information to anyone`
You can't tell a soul.
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an idiomatic phrase that means `don't tell anyone else about this`
You didn't hear it from me.
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a slang phrase said before or after disclosing a rumor or secret
Please keep it to yourself.
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a command or request that asks the recipient to not share certain information
You can trust me.
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used to reassure someone that you can be believed or relied on to keep a secret or promise
I promise not to tell. / I promise I won't tell.
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means you will not share the information that you have
My lips are sealed.
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means you will not discuss or reveal something
It cannot leave this room. / Nothing leaves this room.
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used to express that the information or secret being discussed will not be shared with anyone else
I'll take it to the grave.
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a promise that means one will keep another's secret
Mum’s the word.
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a warning or request to remain silent and not reveal a secret
You have my word.
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used to reassure someone about one's promise or vow
I promise (that) I'll …
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used to announce a vow or commitment to do something
I swear I'll...
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used to solemnly promise one will do something
No matter what (happens), I'll... / No matter what (happens), I'm going to…
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used to announce that one will absolutely do something, in spite of all obstacles