1. a person of great strength, courage, or determination
2. a heavily armored warship
Usage: historical; nautical

Examples

• The general was known as an ironside for his unwavering resolve in battle.
• Edmund Ironside earned his nickname through his fierce resistance to Danish invaders.
• The old ironside sailed into port after months at sea.
• She proved herself an ironside when facing the corporate takeover.
• The ironside’s thick armor plating protected it from enemy fire.
• His reputation as an ironside made him a natural choice for team captain.