This is the 4471st most frequent German word.
kühlen
"To cool."
In this sentence, 'kühlen' refers to the action of lowering the temperature of the drink to make it colder.
Ich möchte das Getränk kühlen, bevor wir es servieren.
I want to cool the drink before we serve it.
Here, 'abzukühlen' uses the root 'kühlen' in the reflexive form to describe a person cooling themselves down, figuratively by relaxing.
Um sich abzukühlen, ging sie eine Runde spazieren.
To cool off, she went for a walk.
This sentence shows 'kühlen' used to describe temperature regulation performed by a device (air conditioning system) for a room or area.