さ冷saますmasu
1.
To lower the temperature of something hot by letting it sit or applying some cooling method until it reaches a more manageable thermal state for consumption or use.
2.
To diminish or calm heightened emotions or excitement, bringing feelings back to a more stable or neutral condition.
3.
To deal with someone in a detached or indifferent manner, suggesting a lack of warmth or affection in the interaction.
Example:
ちょっと冷まして、熱いうちは食べないように。