31.   Others rev their engines in stalled traffic, radios blaring, with nowhere to go and nothing to do.

32.   In Mexico City on Monday, angry motorists honked their horns and revved their engines in an attempt to clear the path.

33.   She explained current emissions testing is conducted simply by revving the engine of a stationary car.

34.   The engine could be revved more easily.

35.   The motorcycle rider responded by revving his engine as loud as he could.

36.   The new controversial edict is sure to rev the engines of many Russian bureaucrats.

37.   The pilot reportedly tried to rev the engines just as the aircraft aproached the landing strip, but one engine did not respond, throwing the plane off balance.