The difference between Hasten and Speed up
When used as verbs, hasten means to move or act in a quick fashion, whereas speed up means to accelerate.
check bellow for the other definitions of Hasten and Speed up
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Hasten as a verb (intransitive):
To move or act in a quick fashion.
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Hasten as a verb (transitive):
To make someone speed up or make something happen quicker.
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Hasten as a verb (transitive):
To cause some scheduled event to happen earlier.
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Speed up as a verb (idiomatic, intransitive):
To accelerate; to increase speed.
Examples:
"The car sped up as it went around the corner."
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Speed up as a verb (transitive):
To increase the speed of something; to make something go faster.
Examples:
"You shouldn't speed up your car when you go around corners."