The phrase "dost evil" is a dated way of saying "doing something bad." Some synonyms for this phrase include "committing a wrongdoing," "acting inappropriately," "engaging in misconduct," and "violating moral standards." Other similar phrases could be "behaving immorally," "acting dishonestly," and "violating ethics." In short, "dost evil" refers to any action that goes against what is right or good, and any number of phrases can be used to describe such behavior, depending on the context and severity of the act. It is important to be mindful of one's actions and strive to act in a manner that upholds ethical and moral standards.