throw together
US /θroʊ təˈɡeð.ər/
UK /θroʊ təˈɡeð.ər/

1.
to make or prepare something quickly and without much care
:
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I had to throw together a quick dinner before the guests arrived.
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The report was clearly thrown together at the last minute.
2.
to bring people or things together in a casual or unplanned way
:
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They just threw together a small party for his birthday.
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The team was thrown together from various departments.