1. start a trend by being the first to do something
Professional
Social
set a precedent for
To 'set a precedent' is to establish a tradition or decision about the way things are to be done in the future. "The event was so impressive that it has set a precedent for department events in the future." In law, it is used to talk about cases or rules that are made that will impact similar situations or cases in the future. "This case will set a precedent for future cases around online harassment." This is a formal phrase you are more likely to hear in professional environments.