let (one) by
To allow one to pass by or around (someone or something). I need to get into the building to retrieve my briefcase—please let me by! I didn't want to drive any faster on the highway, so I moved closer to the curb to let the cars behind me by.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
let someone (get) byand let someone pass by
to permit someone to pass. Please let me get by. I am in a hurry. Let the paramedics by, please.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.