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start up

B1 neutral separable both
In simple words

To make something begin working, or to create a new business

Literal meaning: To start something and get it up and running

Meanings

1 B1 neutral

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

"He got into the car and started up the engine."

Grammar: separable
2 B1 neutral

To establish and launch a new business or organization

"They used their savings to start up a small café in the town centre."

Grammar: separable
3 B1 neutral

To begin suddenly, especially of sounds, music, or activity

"The band started up just as we arrived at the venue."

4 C1 formal

To jump or move suddenly in surprise or alarm (literary/dated)

"She started up from her chair at the unexpected knock at the door."

Usage notes

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.

Commonly used with

engine car business company conversation music computer

Forms

Base
start up
I/you/we/they
3rd person
starts up
he/she/it
Past simple
started up
yesterday
Past participle
started up
have + pp
-ing form
starting up
continuous

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Synonyms

launch establish fire up get going activate found

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