
Dream up
Creativity Involved
Use 'dream up' when implying the creation involves imagination and originality.

They dreamed up a whole universe for their science fiction novel.
Not Always Realistic
'Dream up' can suggest ideas that may be impractical or fantastic.

He dreamed up a plan to build a castle in the sky.
Slight Informality
The phrase 'dream up' is casual, more common in informal speech and creative contexts.

Let's dream up a fun theme for the party!
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