The phrase "constant threat" refers to a continuous and ongoing danger or risk that is always present, looming over someone or something. It suggests an ever-present menace or peril that could strike at any moment without warning, putting people or things in harm's way. The term can be used to describe various situations where there is a constant danger, such as a volatile political climate, a natural disaster prone area, or a high crime rate neighborhood. It implies an unrelenting and persistent threat that requires constant vigilance and preparedness to mitigate its effects.