The phrase "rode roughshod over" means to act in a manner without regard for others' feelings or opinions, often resulting in a disregard for protocol and authority structures. Some synonyms for this phrase include "trampled over," "steamrolled," "dominated," "crushed," "overpowered," "bulldozed," and "subjugated." All of these terms convey a sense of forceful behavior that disregards dissent and can lead to loss of control. They are all useful in describing situations where someone is being oppressive or imposing their will on others in an aggressive manner. It is important to use precise language when describing behavior so that others can fully understand the situation.