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general::
Phrase(s): buzz someone into a place [and] buzz someone in
Fig. to push a button that opens a door latch electrically, allowing someone to use the door and enter. (The process creates a buzz while the latch is open.) • My secretary will buzz you in. • Please buzz in our guest. • Oh, hello. I will buzz you into the lobby. Then take the elevator to apartment 310.
McGrawhill's American Idioms And Phrasal Verbs