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1. To visit someone at some non-specific time in the future. Often stated as an invitation. If you still have questions on the material, why don't you drop by my office sometime, and we'll go over everything step by step. Be sure to drop by the next time you're in the area.
2. To come over briefly (to someone's location) in order to deliver someone or something. In this usage, a noun or pronoun can be used between "drop" and "by." I'll drop by the tools after lunch. I was planning on dropping the kids by at 2 o'clock or so. Is that all right?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
(sometime) Go to drop around (sometime).
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Also, drop in or over . Pay a brief, casual, and usually unannounced visit. For example, I asked her to drop by whenever she was in the neighborhood, or Joan loves to have friends drop in, or We'd love to drop over but we haven't time on this trip. The first term dates from the first half of the 1900s; drop in is from the mid-1600s and drop over from the late 1800s.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
To pay a casual visit to some place: He dropped by the hospital to visit his aunt. She dropped by the office during her vacation to see if she had received any important mail.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.