Phrasal verbs are two or more words that together act as a completely new verb with a meaning separate from those of the original words.
Phrasal Verb:
shake something up
Meaning / Example:
1. to shake a container to mix its contents together well. > Please shake this up before using it. > I shook up the medicine bottle like it says on the label.
2. to reorganize a group or organization, not always in a gentle way. > The new manager shook the office up and made things run a lot better.
Phrasal verbs, also called two-word verbs, are idiomatic expressions wherein the second element of the verb (the adverb or particle) is not necessarily predictable.