runoff primary
noun
(especially in the southern U.S.) a second primary between the two leading candidates of the first primary to provide nomination by majority rather than by plurality.
Origin of runoff primary
An Americanism dating back to 1920–25
Words nearby runoff primary
running time,
running title,
runny,
runnymede,
runoff,
runoff primary,
runout,
runover,
runproof,
runt,
runty