The phrase "wert a witness" can be used to describe someone who has observed an event and can provide testimony or evidence about it. There are many synonyms for this phrase that can be used depending on the context of the situation. Some synonyms include "were a bystander," "were an observer," "were present," "saw what happened," "witnessed the incident," and "took note of what occurred." These synonyms give us an understanding that the person was either directly involved in the event or was present at the time of its occurrence. Regardless of the situation, being a witness is an important role that can help bring justice and clarity to a given scenario.