There are a plethora of synonyms for the phrase "do something." Some of the most commonly used alternatives include: take action, execute, perform, undertake, carry out, accomplish, achieve, complete, conduct, follow through, and implement. Each of these phrases implies a sense of purpose and effort in taking a task from start to finish. Additionally, one could use more specific verbs depending on the task at hand, such as "cook," "paint," "write," or "build." Regardless of the phrase used, the key is to convey a sense of intention and action, indicating that something is being done with a clear goal in mind.