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extra

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noun [countable] American English pronunciation: extra /ˈekstrə/ 
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singularextra
pluralextras
  1. 1
    something that you can buy with something else for an additional payment

    The car comes with most extras that you'd expect, like twin air-bags.

    optional extra:

    A virus checker is available as an optional extra for your computer.

dark pool

a method of financial trading in which share prices are hidden and not openly available to the public

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bottom line

the amount of money that a business makes or loses

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subtweet

to post a tweet, usually a negative one, that mentions a person without using the @ sign, so that they will not see the message on their Twitter feed …

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