- The definition of die hard is someone or something that shows or possesses extreme, absolute or complete loyalty even if facing defeat or hopelessness.
An example of a die hard fan is a person who goes to see a losing team play every single game, even in the rain or if the game is a practice game.
(comparative more diehard, superlative most diehard)
- A person with such an attitude.
From the idiom "to die hard".
- Alternative spelling of diehard.