To lower the temperature of something

To become less excited or intense

कम उत्साहित या तीव्र होना

English Usage: After a few hours, the excitement cooled down.

Hindi Usage: कुछ घंटों बाद, उत्साह ठंडा हो गया।

A low temperature or freshness

ठंडी या ताज़गी

English Usage: The cool of the evening was refreshing.

Hindi Usage: शाम की ठंडक ताज़गी भरी थी।