cutthroat

[kuht-throht]
noun
1.
a person who cuts, throats; murderer.
adjective
3.
ruthless: cutthroat competition.
4.
pertaining to a game, as of cards, in which each of three or more persons acts and scores as an individual.

Origin:
1525–35; cut + throat

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

cutthroat
1530s, from cut (v.) + throat. Of card games, from 1823.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's true that any company in a cutthroat business needs to keep a tight lid on
  product rollout schedules.
Over the past three years, the smartphone arms race between a handful of
  companies has been cutthroat.
There's a tendency to think these teenagers are all cutthroat, that it's all
  about getting discovered.
Ideally, a college would have a sense of tightknit community and cooperation
  instead of a cutthroat and stressful environment.
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