nightmare的动词

nightmare只作名词，不作动词，也没有动词形式。该单词作名词释义如下。

（1）a dream that is very frightening or unpleasant噩梦，梦魇

（2）an experience that is very frightening or unpleasant, or very difficult to deal with可怕的经历，难以处理之事，噩梦。