The document discusses phrasal verbs, which are combinations of verbs and particles (prepositions or adverbs) that create new meanings. A phrasal verb can have both a literal and idiomatic meaning. Some examples given are "put out" meaning to extinguish something literally but also fail or stop figuratively, and "take off" meaning to leave the ground literally but also begin or become popular non-literally. The document encourages looking up additional phrasal verbs like "set off", "wind down", and "take over" in the dictionary to find their different literal and idiomatic definitions and usages.