The phrase "pure horror" is an idiomatic expression used to describe something that is extremely frightening, terrifying or shocking. It conveys a sense of intense fear and disgust, often associated with situations involving violence, death, injury or other traumatizing events. The term can also be used figuratively to describe an experience or situation that is deeply unpleasant or distressing in some other way. Overall, the phrase "pure horror" is intended to convey a strong sense of revulsion and dread.