In English football, what does derby mean?

Originated from the game between Nottingham forest and Derby county. Even though forest are closer to Notts County it signifies a game with intense rivalry to your closest neighbours. read more

Aston Villa vs Birmingham city is a local derby as is Wolverhampton Wanderers vs West Bromwich Albion. Other derbies include: Newcastle United vs Sunderland. Tottenham Hotspur vs Arsenal. In Scotland there are fierce sectarian derby match rivalries between Celtic and Rangers and also Heart of Midlothian and Hibernian. read more

The phrase most likely originated from The Derby, a horse race in England, founded by the 12th Earl of Derby in 1780, since at least as early as 1840 'derby' has been used as a noun in English to denote any kind of sporting contest. read more

My son and I watch English Premier League football and the announcers often refer to a "darby" (not sure on spelling) match. Can't figure out what this means. read more