vt.

1. 开（车）过远（或过久）
2. 过度驱使；虐待

n.

1. （汽车）增速驱动装置；超速档

n.

1. a gear in a motor vehicle providing a gear ratio higher than that of the usual top gear.
2. a state of high or excessive activity.
3. a mechanism allowing the exceeding of a normal operating level in equipment, especially the amplifier of an electric guitar.

v.

1. drive to exhaustion.
2. give (an electric guitar) a distorted sound.