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'.
raffle something off
to give something away by a drawing or raffle.
They are going to raffle off a television set this weekend at the school.
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
A compilation of 50 phrasal verbs.