speed up

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speed up (third-person singular simple present speeds up, present participle speeding up, simple past and past participle speeded up or sped up)

1. (idiomatic, intransitive) To accelerate; to increase speed.

   The car sped up as it went around the corner.

2. (transitive) To increase the speed of something; to make something go faster.

   You shouldn't speed up your car when you go around corners.

   • 1960 February, “The dieselised St. Pancras suburban service”, in Trains Illustrated, page 95:

     The through Moorgate service has been most handsomely speeded up, and suburban trains in both directions now run non-stop between Kings Cross (Underground) and Elstree.

   • 1964 September, “Motive Power Miscellany: BR Workshops”, in Modern Railways, page 220:

     Work on anti-frost precautions on diesel locomotives is to be speeded up to ensure that most if not all locomotives have been dealt with before the winter sets in.

• accelerate
• gain momentum
• pick up speed

• slow down