der·by 
/ˈdɚbi, Brit ˈdɑ:bi/ noun
plural der·bies /ˈdɚbi, Brit ˈdɑ:bi/ noun [count] 1 : a type of horse race that takes place every year — used especially in proper names ▪ the Kentucky Derby 2 : a race or contest
▪ a fishing derby — see also demolition derby, roller derby 3 Brit : a game between local sports teams
▪ a derby between Manchester United and Manchester City 4 US : a hard usually black cloth hat that has a round top and that was worn by men especially in the 1800s —called also (US) derby hat (chiefly Brit) bowler
▪ a fishing derby — see also demolition derby, roller derby
▪ a derby between Manchester United and Manchester City
