conspiracy theory noun
plural ∼ -ries [count] : a theory that explains an event or situation as the result of a secret plan by usually powerful people or groups
▪ Conspiracy theories sprung up soon after the leader's assassination.
▪ Conspiracy theories sprung up soon after the leader's assassination.
— conspiracy theorist noun, plural ∼ -rists [count]
▪ Conspiracy theorists believe the government is hiding evidence of UFOs.
▪ Conspiracy theorists believe the government is hiding evidence of UFOs.
