Phrasal verbs, also called two-word verbs, are idiomatic expressions wherein the second element of the verb (the adverb or particle) is not necessarily predictable.
Phrasal Verb:
cut something off
Meaning / Example:
1. to shorten something. > Cut this board off a bit, would you?
2. to turn something off, such as power, electricity, water, the engine, etc. > Would you please cut that engine off?
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.