Merchant of doom/gloom phrase
A person who is pessimistic and therefore forecasts that something bad or unpleasant will happen.
John is a merchant of doom. He is always predicting that the country will be hit hard by the recession.
A: These reforms will only deepen the recession. B: Come on, bro. Don't be a merchant of doom.
The merchants of doom thought that a flood would cover the Earth’s surface.
The origin of this phrase is not clear.
To be dishonest or deceptive and no one can believe
No one believes what she said. She couldn't lie straight in bed.