derby
UK[ˈdɑːbi]US[ˈdɜːrbi]
n
a sporting event, especially a horse race, that takes place regularly
n
a sports match between two teams from the same city or area
n
a type of stiff felt hat with a rounded crown
Etymology
the word 'derby' originates from the name of edward smith-stanley, the 12th earl of derby, who founded the epsom derby horse race in 1780. the name of the town, derby, is itself of old norse origin, from 'djúrabý', meaning "deer village" or "village with a deer park". the term was generalized to refer to any major horse race and later extended metaphorically to any important sporting contest between local rivals. the sense of a type of hat comes from its association with the attire traditionally worn at such races.
Analysis
this is a loanword and proper noun that has been lexicalized into a common noun. it is not productively formed from separable english morphemes.
Examples
the kentucky derby is one of the most famous horse races in the world.
the local derby between the two football clubs always draws a huge crowd.
he tipped his derby hat as a gesture of old-fashioned courtesy.