The phrase "line of least resistance" refers to the path of least resistance, the easiest and most effortless course of action. Some synonyms for this phrase include the path of least resistance, the easy way out, the road of least resistance, the path of least resistance, the path of least resistance, the path of least effort, the path of least resistance, and the easiest route. Essentially, these phrases describe taking the simplest route without any complications or impediments. While sometimes necessary for efficiency or convenience, it's important to be mindful of making decisions based solely on ease and consider the potential consequences of taking shortcuts in the long run.