Bigwig (2) Today the expression "bigwig" is used to a person who feels important. People never tell someone he is a bigwig. They only use the expression behind his back. "Big wheel" is another way to describe an important person. A big wheel may be head of a company, a political leader, a famous doctor. They are big wheels because they are powerful. What they do affects many persons. Big wheels give the orders. Other people . As in many machines, a big wheel makes the little wheels turn.    ´Ù¶ô¿ø ÊÊ 'Voice of America'¿¡¼­ ¹ßÃéÇÑ ³»¿ëÀÔ´Ï´Ù.