"Hit a dead end" is an English idiomatic expression that means to reach a point where further progress or advancement is no longer possible or viable. It is often used to describe a situation where all options or possibilities have been exhausted, and there are no more paths forward. For example, you might say, "I've been searching for a solution to this problem for weeks, but I've hit a dead end," meaning that you have tried everything you can think of, but cannot find a solution. Another example might be, "Our negotiations with the other party have hit a dead end," meaning that the negotiations have stalled and there is no way to move forward.

"Nail something" is an English idiomatic expression that means to accomplish something successfully, or to do something with precision and accuracy. It can refer to achieving a goal, completing a task, or getting something just right. For example, you might say, "I nailed that presentation!" meaning that you delivered the presentation successfully and effectively. Another example might be, "She really nailed that dance routine," meaning that she performed the dance with precision and skill.

"Nerve-wracking" is an English adjective that describes a situation or experience that is extremely stressful, anxiety-provoking, or tension-filled. It can be used to describe any situation that causes intense worry or nervousness, such as a job interview, a difficult exam, or a high-pressure performance.