Definition of cool-down in English:

cool-down

Pronunciation /ˈkuːldaʊn/

noun

  • 1An instance of cooling down; a reduction in temperature.

  • 2Sport
    A period of moderate physical activity such as walking or jogging, conducted after vigorous exercise in order to reduce the chance of injury.

Origin

Early 20th century; earliest use found in The Windsor Magazine. From cool + down, after to cool down.