start up

US /ˈstɑːrt ʌp/
UK /ˈstɑːrt ʌp/
"start up" picture
1.

to begin to operate or function

:
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The engine finally started up after several attempts.
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I need to start up my computer to check my emails.
:
activateinitiatecommencepower onfire up
2.

to establish a new business or enterprise

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They plan to start up a new tech company next year.
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It takes a lot of capital to start up a business in this industry.
:
establishfoundlaunchset upcommence
1.

a newly established business

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Many new startups fail within the first few years.
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She works for a promising tech startup.
:
new venturenew businessfledgling company
:
start-upstartto start withstart on atstart offstarting linejump-start