Have nerves of steel Definition 1 of 2Pro Tip 1/3Bravery Context Used when admiring someone's courage in dealing with danger or fear. Despite the risks, the pilot had nerves of steel. Pro Tip 2/3Metaphorical Use This phrase doesn't mean actual steel nerves but describes mental strength. During the emergency, her nerves of steel kept everyone calm. Pro Tip 3/3Positive Connotation It's a compliment, suggesting respect for someone's bravery. He approached the wild animal with nerves of steel.