noun[often as modifier]
- A person who strongly opposes change or who continues to support something in spite of opposition: diehard traditionalists she was a diehard Yankees fanMore example sentences
- With the support from their diehard fans, Rangers are confident they are really set for something big this season.
- It became the home of the most diehard opposition to colonialism in the Arab world.
- They have no chairman, no money and only a few hundred diehard supporters who turn up more in hope than expectation.
mid 19th century: from die hard (see die1).