Como dizer "A sete chaves" em inglês

Can I use like it:

I told you it..but..keep it under lock and key.. Tell nobody!

Hadassa,

'Under lock and key' se refere a 'guardar coisas'. Para se falar de segredos, na minha opinião, sugiro: keep something secret.

Keep it secret

Ainda: Keep quiet about it


Bons estudos!

or...
Keep mum about it. (In this context, "mum" does not mean "mom". It means "quiet".)

Mum is the word. (Don't say anything to anyone about it.)

Keep it to yourself. (Don't tell anyone.)

nice!!

Thomas escreveu:or...
Keep mum about it. (In this context, "mum" does not mean "mom". It means "quiet".)

Mum is the word. (Don't say anything to anyone about it.)

Keep it to yourself. (Don't tell anyone.)

Thomas,

We have a saying in Pt that is "Minha boca é um túmulo", it means that if you tell me a secret I won't tell it to anybody.
túmulo = grave

Flávia,

Sugestão:

Minha boca é um túmulo em inglês: My lips are sealed


Mary: I hope you don't tell anyone about this. Alice: Don't worry. My lips are sealed. - Thefreedictionary


Boa sorte!

"Mum as a clam!"

Outra maneira de guardar segredo:

Idiom: Between you and me and the cat's whiskers
Idiom Definitions for 'Between you and me and the cat's whiskers
(Definição Idiomática para "Entre você e eu e bigodes do gato)

This idiom is used when telling someone something that you want them to keep secret.
(Este idioma é usado quando dizer a alguém algo que você quer que eles se mantenham em segredo.)

See you later.