When we think of "big wheel," the first thing that comes to mind is a child's toy featuring a large plastic wheel with pedals that propels the vehicle forward. However, there are many other words and phrases that can be used to describe a "big wheel." Some synonyms include "mover and shaker," "top dog," "big shot," "heavyweight," and "kingpin." All of these terms refer to someone who is influential or important in their field or community. Additionally, "big wheel" can also refer to a large or powerful machine, such as a crane or a bulldozer. Regardless of the context or the synonym used, a "big wheel" is always someone or something of significant size or impact.