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:
slack off
Meaning / Example:
1. to taper off; to reduce gradually. > Business tends to slack off during the winter months.
2. [for someone] to become lazy or inefficient. > Near the end of the school year, Sally began to slack off, and her grades showed it.
Phrasal verbs are multi-word verbs that, like single-word verbs, convey action of the body or mind or occurrences. Phrasal verbs consist of a basic verb + another word or words, usually a preposition or adverb. Example: speak (basic verb) + up (preposition)