保持缄默的密约
a general agreement to keep silent about a subject for the purpose of keeping it secret
The conspiracy of silence around these buried munitions endangered public health.
Many of the witnesses joined in a conspiracy of silence.
Nobody was talking about the problems in our family and I was determined to break the conspiracy of silence.
We felt there had been a conspiracy of silence between the government and the nuclear industry.
Detectives arrived on the island only to find a conspiracy of silence surrounding the murder.
See also: conspiracy