suffer in 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.

pact of silence

A tacit agreement not to discuss a certain topic

speech is silver, silence is golden

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

suffer fools gladly

To be tolerant of stupidity or incompetence in other people.

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.