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nerve

nerve /ˈnɚv/ noun
plural nerves
nerve
/ˈnɚv/
noun
plural nerves
Britannica Dictionary definition of NERVE
[count] : one of the many thin parts that control movement and feeling by carrying messages between the brain and other parts of the body
[noncount] : courage that allows you to do something that is dangerous, difficult, or frightening
[singular, noncount] : the rude attitude of someone who says or does things that make other people angry or upset
nerves [plural] : feelings of being worried or nervous

a bag/bundle of nerves

informal
: an extremely nervous person

get on someone's nerves

: to become extremely annoying to someone

hit/strike/touch a nerve

: to make someone feel angry, upset, embarrassed, etc.

nerves of steel

: an impressive ability to remain calm in dangerous or difficult situations

war of nerves

: a situation in which people do or say things to make other people feel afraid or nervous about what will happen