A phrase that consists of a verb with a preposition or adverb or both, the meaning of which is different from the meaning of its separate parts.
chain someone or something down
to fasten someone or something down with chains.
They chained down the bicycle rack so no one could steal it.
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.