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:
ask someone out (to something)
Meaning / Example:
1. and ask someone out (for something) to invite someone to go out (to something or some place) [on a date]. > He asked her out to dinner, but she had other plans. > She couldn't go, so he asked out someone else.
2. to invite someone for a visit to a place in the country or some other location remote from the center of things. > Tom must be tired of the city. Let's ask him out to our place.
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.