pact of silence

blue wall of silence

Strict secretiveness maintained by the members of a police force with respect to information which might be contrary to their interests, especially information concerning questionable police actions.

dead silence

A particularly notable/awkward silence or absence of response.

deafening silence

A noteworthy silence, or absence of response, especially one signifying disapproval or lack of enthusiasm.

sex pact

An agreement about having sex with a particular frequency, or in a particular way regardless of circumstances.

speech is silver, silence is golden

Not saying anything is often better than speaking too much or saying something inappropriate.

suffer in silence

To tolerate a bad situation without complaining.

wall of silence

Strict secretiveness maintained by the members of a group with respect to information which might be contrary to their interests, especially information concerning questionable actions by members of the group.