Let it cool down.
Meaning: This is asking someone to allow the cake to cool down to a more manageable temperature before eating it.
Choice of Words: Let means to allow something to happen. It refers to the cake that has been taken out of the oven. Cool means to become less hot. Down indicates a decrease in temperature. When you put them together, "Let it cool down" means to allow the cake to become less hot.
Alternative Expressions
Related Expressions