降らすんだよ

make it fall

→ 降らす
phrase Rare #42,231
make it fall 降らす means to cause something to fall, such as rain or petals. んだよ adds an emphatic, explanatory tone.
JA: 魔法で花びらを降らすんだよ。
EN: I’m going to make flower petals fall with magic.

降らすんだよ、降らすんだよ。

I’m going to make it rain, I’m going to make it rain.

さあ降らすんだよ。

Come on, make it rain.

降らすんだよ。

I’m going to make it rain.

さあ、降らすんだよ。

Come on, make it rain.