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[drop-in] /ˈdrɒpˌɪn/
Informal.. Also, dropper-in. a person who or thing that pays an unexpected or uninvited visit:
a feeder for squirrels, raccoons, and other drop-ins.
Informal. a social gathering at which the guests are not expected to stay long:
Be sure to stop by our house for a glass of eggnog at our Christmas drop-in.
provided for short-term patronage:
a drop-in shelter for the homeless.
requiring only insertion to be ready for use:
a drop-in film cartridge.
Origin of drop-in
1810-20; noun, adj. use of verb phrase drop in Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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  1. A place of temporary and sometimes dubious resort: drop-ins for youths wishing marijuana revels (1950s+)
  2. A person who attends classes and other college events without being registered: NBC did some research on college drop-ins (1960s+ Students)
  3. A new car engine as a replacement: If you have a current model-year car, you can get a ''drop-in.'' That's a brand new engine (1990s+)

[sense 2 is the opposite of a dropout]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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drop-ins in Technology

[analogy with drop-outs] Spurious characters appearing on a terminal or console as a result of line noise or a system malfunction of some sort. Especially used when these are interspersed with one's own typed input.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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