Why "over" was used here? Is "over" necessary here? or is "bring over" an idiom?
"Bring over" is not an idiom, however, it is a phrasal verb which implies someone is bringing something from one place to another place. To "bring" just means to take something to a place, but "bring over" describes the action of taking it from a place where it already is and taking it somewhere else. "Over" is not always necessary but can be used to emphasize that someone is coming to a new place. Ex: Bring some food over from that party! Ex: She brought her dogs over.
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