bells and whistles

plural noun Informal.
features added to a product; special parts or functions; extras.

Origin:
1970–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
bells and whistles
 
pl n
1.  additional features or accessories which are nonessential but very attractive: my car has all the latest bells and whistles
2.  additions, such as options or warranties, made to a financial product to increase its market appeal
 
[C20: from the bells and whistles which used to decorate fairground organs]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

bells and whistles definition


  1. n.
    extra, fancy gadgets. : All those bells and whistles add to the cost.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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FOLDOC
Computing Dictionary

bells and whistles definition

jargon
(By analogy with the "toyboxes" on theatre organs). Features added to a program or system to make it more flavourful from a hacker's point of view, without necessarily adding to its utility for its primary function. Distinguished from chrome, which is intended to attract users. "Now that we've got the basic program working, let's go back and add some bells and whistles." No one seems to know what distinguishes a bell from a whistle.
[Jargon File]
(2007-04-03)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Digital cameras come with lots of bells and whistles.
Today's operators often use high-tech bells and whistles to lure their prey.
Because the reality was, guess what, bells and whistles don't go off all day
  long.
Fancy bells and whistles are great as augmentation to courses.
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