Dream up and Throw together

Dream up verb - Devise or invent.

Throw together and dream up are semantically related In some cases you can use "Throw together" instead a verb "Dream up".

Throw together verb - Produce shoddily, without much attention to detail.

Dream up and throw together are semantically related in invent topic. Sometimes you can use "Dream up" instead a verb "Throw together", if it concerns topics such as formulate, assemble, make up, adjust.