Propagate is a verb that means to spread or promote a theory or idea widely.
The origins of our word of the day are firmly rooted in horticulture. The Latin word propagare (pro puh GAR ay) means to set a small shoot or twig cut for planting or grafting.’ The word was borrowed into the English in the late 16th century, and its earliest uses referred to the reproduction of plants or animals.
But more recently, the word’s meaning can extend to the ‘reproduction’ of something intangible, such as an idea or belief. For example: I don’t know how people at the office got the impression that they’d be reimbursed for lunch. I blame Charlie for propagating the idea.