nerve
This word operates on a duality between biological fragility and psychological strength. In a physical sense, it refers to the delicate wiring of the body, but in a social sense, it describes a hard, resilient mental state. When someone has nerve, they possess a boldness that can be perceived as either admirable bravery or offensive arrogance, depending on the social hierarchy. Using the word in the context of losing one's nerve suggests a sudden collapse of confidence, evoking a feeling of trembling or instability. Conversely, steeling one's nerves implies a conscious effort to harden the mind against fear, turning a soft emotional state into a rigid, impenetrable shield.
Countable when referring to the biological anatomical structures in the body. Uncountable when referring to the quality of courage or the general state of anxiety.
Meanings
A fiber of a nerve cell that transmits impulses to the brain or spinal cord.
"The optic nerve connects the eye to the brain."
The courage or audacity to do something difficult or shocking.
"He had the nerve to ask for a raise after being late every day."
A state of steadyness or calmness under pressure.
"The pilot kept his nerve during the emergency landing."