Question 1

What does "start up" mean?

Accepted Answer

To begin operating, or to make a machine or engine begin operating

Question 2

How do you use "start up" in a sentence?

Accepted Answer

He got into the car and started up the engine.

Question 3

Is "start up" formal or informal?

Accepted Answer

"start up" is register-neutral — appropriate in both casual and formal contexts. Used across many contexts: machines (start the engine up), businesses (start up a company), and sounds or conversations (the music started up). The noun 'startup' (written as one word) comes directly from this phrasal verb and refers to a newly established business, especially in tech.

start up

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