Meaning: Open a business
Example: The firm STARTED UP on a shoestring budget.
Meaning: Begin, especially sounds
Example: There was a pause, then the noise STARTED UP again.
Meaning: When an engine starts working
Example: The car STARTED UP first time.
Meaning: Make an engine work
Example: I STARTED the car UP.
Meaning: Sit or stand upright because someone has surprised you
Example: He STARTED UP when I entered the room and tried to hide what he was doing.