definition of
nerve

[1] #1 nerve n. [nervus] any bundle of nerve fibers running to various organs and tissues of the body. wn

[2] #2 nerve n. [heart, mettle, spunk] the courage to carry on; "he kept fighting on pure spunk"; "you haven't got the heart for baseball". wn

[3] #3 nerve v. [steel] get ready for something difficult or unpleasant. wn

[4] #4 nerve n. [boldness, brass, face, cheek] impudent aggressiveness; "I couldn't believe her boldness"; "he had the effrontery to question my honesty". wn