to become cool or cooler
Example:
- We cooled off with a swim in the lake.
- He went for a swim to cool off.
to become calm, less excited or less enthusiastic
Example:
- I think you should wait until she's cooled down a little.
Extra examples:
- He's cooled down somewhat since this morning,
- Let things cool off for a while.
to slow down or decrease
Example:
- Growth in the market has started to cool down.