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1.
To increase the velocity of something. To speed something up. To step on the gas.
I hit the gas and I accelerate.
by 5'1"Racer December 27, 2005
 
2.
To speed(positive acceleration, aka acceleration) up slow down(Negative acceleration, aka deceleration)or change direction(aka turn)
I accelerated out of the street accelerated as i stopped at the light and accelerated as i turned the corner
by Daniel Cannon January 10, 2008