From Longman Dictionary of Contemporary Englishswear somebody to secrecyswear somebody to secrecyTELL A SECRETto make someone promise not to repeat what you have told them → secrecy
Examples from the Corpus
swear somebody to secrecy• Nobody knows much about the organization because its members are all sworn to secrecy.• Lois had sworn her to secrecy.• He swore his family to secrecy and tried to continue living a normal life, making regular stage appearances and several movies.• Jett swore me to secrecy, with particular reference to you.• Mia swore me to secrecy after she told me about the affair.• Amy told no one else except her younger brother Howard, and she swore him to secrecy.• "What's she doing here?" "I'd better not say. She swore me to secrecy."• She swore him to secrecy and asked him to build the barrel.• They swore one another to secrecy.• No, surely he would swear her to secrecy - if he really did agree in the end to Miguel's request. 