Revving

Revving is a quick opening and closing of the throttle to raise engine speed, usually with the clutch pulled or in neutral. A short, sharp rev is also called a blip.

It has real uses: blipping the throttle on a downshift matches engine speed to road speed and prevents the rear wheel from locking or hopping; off-road riders blip to lift the front over obstacles; and a light blip can help clear a fouled plug on a two-stroke.

Revving a cold engine hard, however, increases wear because the oil has not yet reached all parts. Excessive revving while stationary also annoys neighbours and draws attention from the police.