The phrase "to reduce the temperature" means to make something cooler or decrease its level of heat.
Sentences with «to reduce the temperature»
To reduce the chance of either type of damage, reduce the temperature of the dishwasher or rinse your dishes more thoroughly before loading the machine. (wikihow.com)
Bring to the boil and then reduce the temperature and leave to simmer for 10 - 15 minutes. (deliciouslyella.com)
As the convection adds to the heat transfer, it always reduces the temperature gradient from what it would be without convection, it does not produce it. (judithcurry.com)