mental telepathy
mental telepathy {n. phr.}
The passing of one person's thoughts to another without any discoverable talking or carrying of signals between them.
Mrs. Smith knew the moment her husband's ship sank on the other side of the world. It seems like a case of mental telepathy.
Most or all men who practice mental telepathy on stage have really trained themselves to detect tiny clues from the audience.
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Source: A Dictionary of American Idioms