An underground system of interconnected tunnels occupied by rabbits. / A confusingly labyrinthine environment.

Used other than figuratively or idiomatically: see rabbit, hole. (The entrance to) a rabbit warren or burrow. / (usually with article) A bizarre world, where everyday rules do not apply.

A series of horse races at a particular racecourse on a particular day

The patterns of behaviour between ethnic groups of people / The branch of sociology that studies these patterns

Hatred towards an ethnic group.

Discrimination on grounds of race or ethnicity.

Straight lane racing on an official racetrack, typically a dragstrip. / (colloquial) Any illegal street racing.

present participle of drag race

(chiefly Britain, games) A race in which competitors must carry an egg on a small spoon and race to the finish line without dropping the egg.

(games, racing) A race in which a team of two players are joined together at opposite ankles, and must complete a short sprint before the other teams.