Meaning of “nerve” - Learner’s Dictionary

nerve

noun uk us /nɜːv/
PART OF THE BODY [ C ]

one of the threads in your body that carry messages between your brain and other parts of the body:

the optic nerve
nerve cells/endings
BEING BRAVE [ no plural ]

the quality of being brave:

[ + to do sth ] I haven't got the nerve to tell him I'm leaving.
He lost his nerve and couldn't go through with it.
RUDENESS [ no plural ]

the rudeness necessary to do something you know will upset someone:

You've got a nerve, coming here!
[ + to do sth ] I can't believe she had the nerve to talk to me after what happened.

(Definition of “nerve” from the Cambridge Learner’s Dictionary © Cambridge University Press)