To vibrate means to move or shake back and forth in short, quick movements. This can refer to something that is making a sound by rapidly moving its parts, such as an instrument or device like a phone. It also refers to things that are physically shaking or trembling, such as when you feel the ground vibrating during an earthquake or when your car's engine is vibrating. In addition, it can describe something that is in motion but not necessarily making noise, for example, a vehicle moving on a road. The word "vibrate" comes from the Latin verb "vibrare," meaning to make waves or cause to tremble.