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:
pair off [for two people or other creatures]
Meaning:
to form a couple or pair.
Example:
Everyone should pair off and discuss the issue for a while.
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.