The term "long shot" is an idiomatic expression that means a remote or unlikely possibility. It refers to something that has little chance of happening, but if it does occur, it would be considered a major success or achievement. The phrase can also refer to someone who is not favored to win in a competition or situation, but they still have the potential to come out on top despite being an underdog. In essence, "long shot" describes something that may seem unlikely or improbable, but it's worth taking a chance on anyway because you never know what might happen.