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English definition of “nerve”

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nerve

noun  /nɜrv/ us  

nerve noun (BODY FIBER)

biology [C] a group of long, thin fibers in the body, esp. in the brain, which send and receive messages that control how the body reacts to signals it receives, such as to changes in temperature or pressure against the skin

nerve noun (BRAVERY)

[U] bravery or confidence necessary to do something difficult or unpleasant: It takes a lot of nerve to get up in front of a class when you’re not used to it. [U] Nerve also means the ability to do something rude without caring about other people’s feelings: She has some nerve. I can't believe she had the nerve to call me fat!
(Definition of nerve from the Cambridge Academic Content Dictionary © Cambridge University Press)
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