hit a snag
To encounter an issue, drawback, or challenge. Our plans for a relaxing night at home hit a snag when a pipe burst in the basement.
hit a snag
Fig. to run into an unexpected problem. We've hit a snag with the building project. I stopped working on the roof when I hit a snag.
hit a snag
Encounter a problem or obstacle. For example, We've hit a snag with this building project. The noun snag has been used in the sense of "a sharp or rough projection," such as would impede passage, since the 1500s.