1.
When something speeds up or when you speed it up, it moves or travels faster.
You notice that your breathing has speeded up a bit...
He pushed a lever that speeded up the car.
PHRASAL VERB: V P, V P n (not pron), also V n P
2.
When a process or activity speeds up or when something speeds it up, it happens at a faster rate.
Job losses are speeding up...
I had already taken steps to ~ a solution to the problem...
I kept praying that the DJ would speed the music up.
PHRASAL VERB: V P, V P n (not pron), V n P