英和和英

to violate the privacy of correspondence

a deed of transfer

a deposit-certificate

a deed of covenant

to disclose a secret to one―reveal a secret to one―divulge a secret to one―confide a secret to one―unbosom oneself of a secret to one―unburden one's heart of a secret to one―let one into the secret

a certificate called a receipt

a brief, written correspondence that is confidential

a registered bond

The matter must be kept secret

to swear one to secrecy―bind one to secrecy

to disclose a secret―divulge a secret―reveal a secret

an auricular confession

a secret document

a secret promise

a document called scrip

backstairs intimacies

an open secret

a certificate of good conduct

matter or event defined by evaluation (secret matter)

cryptic writings

to swear secrecy―vow secrecy―pledge oneself to secrecy―bind oneself to secrecy

a voucher

to observe strict secrecy

a collateral bond

a secret word

to expose a secret

to divulge a secret―blab a secret―let out a secret―let the cat out of the bag

to keep the matter a secret

an attested document

an imperial edict secretly issued