Hang over one's head is a phrase that describes a situation in which someone is facing a looming threat or impending doom. The two crossword solutions for this phrase are LOOM and IMPEND. LOOM means to appear or become visible gradually, while IMPEND means to be about to happen or be imminent. Therefore, the phrase 'hang over one's head' can be interpreted as a situation in which something is gradually becoming visible and is about to happen.