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Related to speed up: Speed test
speed speed up
Speed can be a noun or a verb.
The speed of someone or something is the rate at which they move.
Speed is often used in prepositional phrases beginning with at or with.
You can say that someone or something moves at a particular speed.
If you want to emphasize how fast something is moving, you can use at and an adjective in front of speed.
If you want to emphasize how quickly something happens or is done, you use with and an adjective in front of speed.
In stories, if someone speeds somewhere, they move or travel there quickly. When speed has this meaning, its past tense and past participle is sped.
If something speeds up or if you speed it up, it moves, happens, or is done more quickly.
The past tense and past participle of speed up is speeded up.
|Verb||1.||speed up - move faster; "The car accelerated"|
|2.||speed up - cause to move faster; "He accelerated the car"|