an agreement to say nothing about an issue that should be generally known保持緘默協定；攻守同盟
柯林斯高階英漢雙解學習詞典釋義
N-VAR
密謀;陰謀
Conspiracy is the secret planning by a group of people to do something illegal.
例句
Seven men, all from Bristol, admitted conspiracy to commit arson...7個人都來自布里斯托爾，他們承認了合謀縱火。He believes there probably was a conspiracy to kill President Kennedy in 1963.他認為1963年肯尼迪總統遇刺身亡可能是一個陰謀。
N-COUNT
陰謀
A conspiracy is an agreement between a group of people which other people think is wrong or is likely to be harmful.
例句
It's all part of a conspiracy to dispense with the town centre all together and move everything out to Meadowhall...徹底拋開市中心而把所有東西都搬到梅多霍爾購物中心，這完全是一場陰謀的一部分。There was no evidence to link the brigade to any conspiracy against Mr Bush.沒有證據表明這幫人對布什先生圖謀不軌。
PHRASE
（為了私利）保持緘默的密約
If there is a conspiracy of silence about something, people who know about it have agreed that they will not talk publicly about it, although it would probably be a good thing if people in general knew about it.
例句
Detectives have run into a conspiracy of silence in the tight-knit communities of the peninsula.偵探們犯了難，半島上各個群體抱成一團，達成了保持緘默的密約。
英漢詞典釋義
n.
陰謀, 密謀，策劃
The men were found guilty of conspiracy to murder.這些人被裁決犯有陰謀殺人罪。
英英詞典釋義
Noun
1. a secret agreement between two or more people to perform an unlawful act
2. a plot to carry out some harmful or illegal act (especially a political plot)
3. a group of conspirators banded together to achieve some harmful or illegal purpose