The phrase "hold a gun to one's head" is often used to describe a situation where someone is being threatened or coerced into doing something. However, there are a variety of other phrases and idioms that can be used to describe a similar situation. For example, someone might say that they feel "backed into a corner" or "put on the spot." Another common phrase is "having a knife at one's throat," which can also describe a threatening situation. Ultimately, these phrases all convey a sense of danger and urgency, indicating that someone is being forced to act against their will.