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third-person singular simple present speeds up, present participle speeding up, simple past and past participle speeded up or sped up
(idiomatic, intransitive) To accelerate; to increase speed. examples
(transitive) To increase the speed of something; to make something go faster. quotations examples
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.
1960 February, “The dieselised St. Pancras suburban service”, in Trains Illustrated, page 95
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.
1964 September, “Motive Power Miscellany: BR Workshops”, in Modern Railways, page 220