The phrase "get smart" can be expressed in a multitude of ways, depending on the context and intention. One synonym for this phrase could be "wise up", which implies gaining knowledge or understanding. Another could be "sharpen up", which suggests being more alert and attentive. "Improve one's intelligence" and "enhance one's intellect" are also valid synonyms for "get smart". "Educate oneself" and "cultivate one's mind" are more complex phrases that convey the same meaning. Ultimately, the choice of synonym depends on the specific usage and desired tone, but there are plenty of options available for those wishing to express the concept of "getting smart" in different ways.