dream something up
phrasal verb with dream verb uk/driːm/ us/driːm/ dreamed or dreamt | dreamed or dreamt
凭空想出，虚构出（通常为荒诞不经的事）
to invent something very unusual and usually silly
This is the latest ploy dreamed up by advertising companies to sell their new products. 这是广告公司为了推销其新产品而想出来的最新招数。