Longman Dictionary of Contemporary English homepage

killer

2 adjective
     
killer2 [only before noun]
1 very harmful or dangerous:
a killer hurricane
a swarm of killer bees
2 informal very attractive, good, impressive etc:
a book called 'How to Build a Killer Website'
3

killer instinct

a very strong desire to succeed in a situation or activity etc that is very competitive:
Young players these days lack the killer instinct.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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