accelerate · verb /əkˈsel.ə.reɪt/
accelerate (HAPPEN)
C1 I or T to start to happen more quickly, or to make something start to happen more quickly
Dictionary example:
Inflation is likely to accelerate this year.
Learner example:
Fashion has always been changing but I think this process accelerated after the Second World War. (Certificate in Advanced English; C1; Hungarian)
accelerate (VEHICLE)
C2 I to move or cause yourself or a vehicle to move faster
Dictionary example:
The car in front accelerated and left us behind.
Learner example:
When I ride my bike and start accelerating, I feel that I move with the speed of the wind. (Certificate of Proficiency in English; C2; Greek)