You shouldn't speed up your car when you go around corners.
Used in the Ending of Sentence
The hot-and-cold-water treatment Sweetie referred to is called kneipping: you put your feet or your wrists or your shins in water to force your circulation to speed up.
Meaning of sped up for the defined word.
Grammatically, this idiom "sped up" is a verb, more specifically, a verb form.