The term 'hover threateningly' can be summarized by two crossword solutions: 'LOOM' and 'IMPEND'. 'LOOM' is a verb meaning to appear or take shape gradually, often in a threatening or ominous way. 'IMPEND' is a verb meaning to be about to happen or be imminent, especially something unpleasant or threatening. Together, these words suggest an image of something looming over a person or situation, threateningly close and ready to happen.