"Dost something about it" is a phrase used to urge someone to take action on a particular issue or problem. However, there are numerous synonyms that can be used to express the same sentiment. Some examples include "take action", "do something", "address the issue", "solve the problem", "deal with it", "fix it", "rectify the situation", "tend to the matter", and "make a move". Depending on the context, these synonyms can be used interchangeably and can help to convey a sense of urgency or importance in addressing a particular matter.