What does "speed up" mean?

To accelerate; to increase speed.

Speed up

Common synonyms include: accelerate, quicken, hasten, accelerate, accelerate development, accelerate progresses.

/spiːd.ˈʌp/ verb

verb ·Moderate ·College level

Verb

1
To accelerate; to increase speed. idiomatic, intransitive
"The car sped up as it went around the corner."
2
move faster wordnet
3
To accelerate (something): to increase its speed, to make it go faster. transitive
"You shouldn't speed up your car when you go around corners."
4
cause to move faster wordnet

"The car sped up as it went around the corner."