A phrase that combines a verb with a preposition or adverb or both and that functions as a verb whose meaning is different from the combined meanings of the individual words
Phrasal Verb:
burn down
Meaning / Example:
1. [for a building] to be destroyed by fire. > The barn burned down. > There was a fire, and the old factory was burned down.
2. [for a fire] to burn and dwindle away. > The flame burned down and then went out.
Phrasal verbs consists of a basic verb + another word or words. The two or three words that make up a phrasal verb form a short 'phrase' - which is why we call them 'phrasal verbs'.