the cherry on (top of) the cake
01
最後の決め手, 完璧にする仕上げ
the final adjustment to something already good or satisfactory just to make it perfect
approving
idiom
例
After a long day of work, coming home to a hot meal prepared by my spouse was great, and the fact that they had also picked up my favorite dessert was the cherry on top of the sundae.
無料のデザートは、すでに完璧な夕食をさらに良くする最後の決め手だった。
